Vram?

So in the G5 manual it says you can have no more than 1gb of Vram across all of the cards.
Does this mean that the system is able to share memory off of other cards?
i.e. If I installed 2 video cards and only used one monitor output off of each would it perform better. If I installed 2 cards, only used the outputs of one card would it perform any different??

I suspect it is BEST to just have one monitor per card.

Similar Messages

I just updated my RAM and I keep getting a crash report. I have a 21.5 Inch mid 2010 imac. I also am experiencing slow load times and when I try to open Final Cut it says that quartz extreme is not compatible and that I have no VRAM even though I do.

I just updated my RAM (replaced the two 2 gig cards with two Corsair 8 gig cards) and I keep getting a crash report. I have a 21.5 Inch mid 2010 imac. I also am experiencing slow load times with Photoshop and when I try to open Final Cut it says that quartz extreme is not compatible and that I have no VRAM even though I do.
Here is the crash report:
Interval Since Last Panic Report: 5426204 sec
Panics Since Last Report:          2
Anonymous UUID:                    2DD57DDB-BB42-5614-395A-CA6225BDAFD9
Wed Mar 20 11:36:53 2013
panic(cpu 0 caller 0xffffff801aa43d8e): "a freed zone element has been modified in zone: maps"@/SourceCache/xnu/xnu-2050.18.24/osfmk/kern/zalloc.c:219
Backtrace (CPU 0), Frame : Return Address
0xffffff81eb0eb950 : 0xffffff801aa1d626
0xffffff81eb0eb9c0 : 0xffffff801aa43d8e
0xffffff81eb0eba00 : 0xffffff801aa435d2
0xffffff81eb0ebae0 : 0xffffff801aa663f7
0xffffff81eb0ebb20 : 0xffffff801aa67398
0xffffff81eb0ebc70 : 0xffffff801aa6887c
0xffffff81eb0ebd20 : 0xffffff801ad5b8fe
0xffffff81eb0ebf50 : 0xffffff801ade182a
0xffffff81eb0ebfb0 : 0xffffff801aaced33
BSD process name corresponding to current thread: launchd
Mac OS version:
Not yet set
Kernel version:
Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64
Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333
Kernel slide:     0x000000001a800000
Kernel text base: 0xffffff801aa00000
System model name: iMac11,2 (Mac-F2238AC8)
System uptime in nanoseconds: 1070542822
last loaded kext at 707348380: com.apple.driver.AppleIRController    320.15 (addr 0xffffff7f9c53e000, size 28672)
loaded kexts:
at.obdev.nke.LittleSnitch    3908
com.apple.driver.AppleIRController    320.15
com.apple.driver.AppleUSBCardReader    3.1.0
com.apple.driver.AppleFileSystemDriver    3.0.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    34
com.apple.iokit.SCSITaskUserClient    3.5.1
com.apple.driver.XsanFilter    404
com.apple.iokit.IOAHCIBlockStorage    2.2.2
com.apple.driver.AppleUSBHub    5.2.5
com.apple.driver.AppleFWOHCI    4.9.6
com.apple.driver.AirPort.Atheros40    600.70.23
com.apple.driver.AppleUSBEHCI    5.4.0
com.apple.driver.AppleAHCIPort    2.4.1
com.apple.iokit.AppleBCM5701Ethernet    3.2.5b3
com.apple.driver.AppleUSBUHCI    5.2.5
com.apple.driver.AppleEFINVRAM    1.6.1
com.apple.driver.AppleACPIButtons    1.6
com.apple.driver.AppleRTC    1.5
com.apple.driver.AppleHPET    1.7
com.apple.driver.AppleSMBIOS    1.9
com.apple.driver.AppleACPIEC    1.6
com.apple.driver.AppleAPIC    1.6
com.apple.driver.AppleIntelCPUPowerManagementClient    196.0.0
com.apple.nke.applicationfirewall    4.0.39
com.apple.security.quarantine    2
com.apple.driver.AppleIntelCPUPowerManagement    196.0.0
com.apple.iokit.IOUSBHIDDriver    5.2.5
com.apple.iokit.IOSCSIBlockCommandsDevice    3.5.1
com.apple.iokit.IOUSBMassStorageClass    3.5.0
com.apple.driver.AppleUSBMergeNub    5.2.5
com.apple.driver.AppleUSBComposite    5.2.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.5.1
com.apple.iokit.IOBDStorageFamily    1.7
com.apple.iokit.IODVDStorageFamily    1.7.1
com.apple.iokit.IOCDStorageFamily    1.7.1
com.apple.iokit.IOAHCISerialATAPI    2.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily    3.5.1
com.apple.iokit.IOUSBUserClient    5.2.5
com.apple.iokit.IOFireWireFamily    4.5.5
com.apple.iokit.IO80211Family    500.15
com.apple.iokit.IOAHCIFamily    2.2.1
com.apple.iokit.IOEthernetAVBController    1.0.2b1
com.apple.iokit.IONetworkingFamily    3.0
com.apple.iokit.IOUSBFamily    5.4.0
com.apple.driver.AppleEFIRuntime    1.6.1
com.apple.iokit.IOHIDFamily    1.8.0
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    220
com.apple.kext.AppleMatch    1.0.0d1
com.apple.security.TMSafetyNet    7
com.apple.driver.DiskImages    344
com.apple.iokit.IOStorageFamily    1.8
com.apple.driver.AppleKeyStore    28.21
com.apple.driver.AppleACPIPlatform    1.6
com.apple.iokit.IOPCIFamily    2.7.2
com.apple.iokit.IOACPIFamily    1.4
com.apple.kec.corecrypto    1.0
Model: iMac11,2, BootROM IM112.0057.B00, 2 processors, Intel Core i3, 3.2 GHz, 16 GB, SMC 1.64f5
Graphics: ATI Radeon HD 5670, ATI Radeon HD 5670, PCIe, 512 MB
Memory Module: BANK 0/DIMM1, 8 GB, DDR3, 1333 MHz, 0x029E, 0x434D5341384758334D314131333333433920
Memory Module: BANK 1/DIMM1, 8 GB, DDR3, 1333 MHz, 0x029E, 0x434D5341384758334D314131333333433920
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.70.23-P2P
Bluetooth: Version 4.0.9f33 10885, 2 service, 18 devices, 0 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: ST31000528AS, 1 TB
Serial ATA Device: HL-DT-STDVDRW GA32N
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4
USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0xfd110000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 6
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa120000 / 3

There have been a few reports on here where Corsair RAM seems to have caused users a lot of grief with crashes.
The recommendation on here, mostly, is to only buy RAM from macsales.com or crucial.com as they guarantee their modules will work and offer a no quibble lifetime guarantee.
I'd put the original RAM back in, return the Corsair chips for a refund and re-order from one of those two companies.
http://eshop.macsales.com/shop/apple/memory/iMac
http://www.crucial.com/

Dual display and VRAM usage.

Hi, back in the days I wanted a 12" iBook but couldn't afford one, last autumn thought I decided to get a Macbook Pro, the update came and...
.. it had 128MB vram.
I want to use dual screen and maybe even occasional gaming, I couldn't decide if this where sufficient for my needs or not so I waited for the june update.
The mid-07 MBP arrived and, it had 128MB vram AGAIN!
Why oh why Apple? Oh, don't answer that, it's because you're in bed with Intel and want to force feed us useless highest end CPUs. But all I care for is the VRAM, why do I have to pay a ****-of-a-lot for a 1/11th faster CPU?
Anyway, I tried to decide if I should "bit the sour Apple" and get the mid modell or just get the low one because that one is much more price worthy. A few days ago I ordered the low end one.
But then I've seen on barefeats that he says that a 30" ACD display would use 128MB vram of the 256MB vram modell, are vram always splitted between displays in OS X?
You see, if the extra 20" 1680x1050 display only use 1680x1050x(3 or 4) bytes that is ok, maybe even if it's double buffered (is it?), because then I will probably have like 100MB vram left for all my windows and for desktop usage that is probably ok. But if the vram is shared between displays and my 20" which I will use most only get 64MB vram that's quite low.
I know I can turn of the sleeping capabilities of the MBP and shut the lid and only use one screen but that's a quite lame solution.
I hate how Apple does this, and it seems to worry a lot of people. Some get the more expensive modell and hate that they had to do it, some doesn't, and some don't buy a machine at all .. I would probably have stayed in the last crowd.
256MB vram can't have cost them many tens of dollars, why not have that in all modells? Why is the middle one even needed? Just make 2.4GHz CPU and option in that case.
Anyway, does anyone know how much vram my screen will have available? Will 128MB work for me with all the regular desktop apps I will have running? Or should I really go with the 256MB one? The tricky part is that my MBP might be shipped today or similair.
I've called Apple support three times but noone of them knows how this works so they aren't for much help.
(Dell vostro 1500 sells here in Sweden for less than half the price of the mid MBP and comes way more balanced, you can even get a 1680x1050 screen. Sure it has 2.0GHz CPUs or whatever but I don't care about that. Where is the old "omg MHz myth"-Apple? Please understand CPU speed isn't everything. Instead of leading the MHz myth fight it ;D, start calling the CPUs T7300 and so on aswell ;D)

Hi Johan, actually the VRAM used by OS X is likely to be quite a bit more than just your screen resolution multiplied by 3 or 4, since each open window is composited offscreen for the shadow effects and for things like zooming (Ctrl-Mousewheel) and the "Genie effect".
I'm pretty sure the total VRAM isn't divided in half for each of the two displays though, as it will be allocated from the video driver on an as-needed basis. In practice, with both displays active and a few windows open, you should still have maybe 80-90% of your VRAM available for applications.
Games and other VRAM-heavy applications are a special case as these will typically use as much VRAM as you can give them, and swap out to system RAM via the PCI-X bus when they need more (and unlike swapping to disk, swapping into VRAM from system RAM is still pretty fast).

EFI Update 1.3 and VRAM

Hello everybody! When I was installing EFI Update 1.3 The instructions said that press on/off power bottom, saw the light blinking. But the instructions didn't say that you can hear a very strong noise.... Is it normal?? Now, EFI Update program say that all it's OK, but when I wanna restart VRAM (Commandoption+PR) the second sound start too slowly... So, please, what can I do???
Thank you so much and regards

Same here actually. It worked for a bit though.

Does the amount of VRAM matter for AP3 when considering the graphics options in the new iMacs?

The graphics options go from 512MB to 2GB. The cards themselves (6750, etc) are very capable, but does the amount of VRAM matter? Will 512MB be sufficient for AP3 or should I go for the 2GB of graphics RAM? Why or why not? Thanks.

Well Aperture is one of the few programs in the world that will havely rely on the GPU. 512 MB should be suffiecient (*), but more will bring more speed to Aperture.
*: At least it is in my machine, though using brushes extensively will slow things down quite a bit.

How to increase vram in macbook pro 13 early 2011

I recently bought Macbook Pro core i5, 13in early 2011.
Is there any way to increase VRAM in my macbook pro. I want to work for Graphics specially in After effects and Adobe Photoshop. But when I started photoshop I saw an error that I have only 384MB of vRAM I can't work on such low vRAM... I am feeling I lost my money because of no available enough ram
Current specs are:
Macbook Pro 13in i5 - 4GB - 320 GB. early 2011

If all you did to install an application was drag it to the Applications folder, it will be completely uninstalled by dragging it to the Trash and emptying the Trash. How many other files that you've trashed and emptied can you still find on your computer?
Why bother to ask questions if you aren't going to believe the answers you're given? That's just a waste of your time and the time of anyone who answers you.

PS CC Says I need more than 512 Vram ...

I was using Photoshop last night just to prep a couple of photos for class submission (3 pictures, just reducing their size for web consumption), and I got the message stating that I needed more than 512 Megs of Vram, which was odd to me, as I have 1024 Dedicated available on my video card. I don't run a dual monitor setup any longer, but I do have an ASUS PBs278 that's running at 2560 X 1440. My current graphics card is an ATI Radeon 6800 HD, and my windows 7 system is running on 8 gigs of ram. Up till within the last week, CC has worked just fine, but the other day on boot, it took an unusually long time to get into the software. It eventually did, and I'm wondering if that was an update or some such that's now made the software decree that if it doesn't have the 512 it thinks it should have, the 3d functions won't happen. I don't know if it's a consequence of the larger quantity of pixels being pushed, or if it's the video card getting too old to support CC at such a high resolution now, but some help would be amazing.

Windows 7, 64 bit. I haven't been able to replicate the error, but I have the new drivers as well. I hope this just ends up being a fluke.

What is VRAM in new BIOS 1.4 for Qosmio X770?

for 770 series
about to download now!!!
what is VRAM ?
Version 1.40 - 2011-10-29
Added: Hynix b-die VRAM support.
Release Notes
For CD-ROM BIOS updates: Type BIOS then press enter at the C:\ prompt.
For all updates: After the update completes, the computer will automatically shut down or restart.
Power on the computer if it is off.
While the "Toshiba" LOGO is displayed, press the F2 function key to start BIOS Setup.
Check the version of BIOS and press the F9 function key then Enter to load setup defaults.
Press the F10 function key then Enter to save settings and exit. The computer will automatically reboot.

im not going to install this bios, until someone confirms the throttling problem has been resolved :P

I have a Macbook Pro june 2011... I have 8GB ram but I only have 256mb VRAM... I've read some other questions about this and I realized... Why do I not have 560mb of VRAM since I have 8GB of RAM? Is there any way to get more VRAM to play games on steam?

I have a Macbook Pro june 2011... I have 8GB ram but I only have 256mb VRAM...
I've read some other questions about this and I realized... Why do I not have 560mb of VRAM since I have 8GB of RAM?
Is there any way to get more VRAM to play games on steam?
I've learned by reading other topics that I can't upgrade my graphics card on my Macbook Pro because it's soldered into the motherboard or somthing like that, but please tell me if there is any way to get more video ram by chaning some setting or upgrading something else. I'd also like to know why I only have 256MB of VRAM when I have 8GB of RAM, since I have 8GB of RAM I thought I was supposed to have 560mb of VRAM...
So the two questions are...
Is there any way to upgrade my VRAM, so that I can play games on steam?
Why do I only have 256MB VRAM when I have 8GB total RAM?
Other Info:
I have a quad core i7 Processor.
My graphcics card is the AMD Radeon HD 6490M.
I am also trying to play games on my BOOTCAMPed side of my mac, or my Windows 7 Professional side.
THANK YOU SO MUCH IF YOU CAN REPLY,
Dylan

The only two items that a user can change on a MBP are the RAM and HDD (Retinas not included). You have what the unit came with and the only way you will be able to change that is to purchase a MBP with superior graphics
If you are very much into gaming, the I suggest A PC. They are far superior for that type of application to a MBP.
Ciao.

Can I upgrade the video card in my 2009 iMac with the new ATI 2 GB VRAM card?

I am looking for more video RAM for video, CGI and animation work in Blender.
I may purchase Final Cut Pro X in the near future and I need to make sure there is enough video RAM to be able to work with this version of FInal Cut.
I, currently, use Final Cut 4 Express and though this runs fine, through Rosetta, on my current setup, I fear this much newer version may need more graphics power than I have, now.
I, also noticed some lag when working with Blender.
No where near as much graphics or video/animation lag as when I using Blender on my old G4m but it's still slightly noticeable.
I realize I may have to install this myself.
Can I purchase, somewhere, Apple's 1 or 2 GB ATI card seperately or from a third party vendor and install, myself.
I have seen posts that tell that the 27 inch iMac has a removable video card and is not soldered to the logic board like in the 21 inch models.
If true, is there a complete procedure for the iMac breakdown, installation of the video card and reassembly procedure?
My iMac only has the stock 256 MB VRAM graphics card.
If the take down looks more difficult than I feel I can attempt, I have an Apple authorized reseller, repair facilty here, in my area.
Could I purchase the card and have them install it for a fee?
ThanX for all of the info and advice, in advance
Michel

You will need to check if your model originally was offered with a custom build option that included a different graphics card. If so, you may be able to have it done; here is a fellow who managed to do it on a 2011 iMac (graphics card not soldered) and the model originally offered a better card option:
https://discussions.apple.com/message/18919734#18919734
Is this yours:
http://everymac.com/systems/apple/imac/specs/imac-core-2-duo-3.06-27-inch-alumin um-late-2009-specs.html
In particular, click on the link in this section of the specs:
I'd check either with Apple and/or an AASP to see if it can be done with yours or if yours is one of those where it is part of the Logic Board/soldered to it.

To upgrade from 10.5.8 to 10.6 do i need to purchase software to backup info or am I safe to download. Duo 2 Intel Core, 256 Vram, NV

NVIDIA (0x10de)
Duo 2 intel core
1 Core
256 Mb VRAM
32 bit color
With the above characteristics, will my computer be able to take 10.6 upgrade online or do i need more memory to support that?
Also, what is a good graphics program can be installed on my current system 10.5.8? in case i cant upgrade.
Also why does my iphone 3 not register when i plug it into the jack on the back of computer. It used to be acknowleged.
my phone is suffering from not being validated, low self esteem. is there a confidence booster for the existing? i need to take my pics off and onto the harddrive.
thanks for any help!

So we know more about it...
At the Apple Icon at top left>About this Mac, then click on More Info, then click on Hardware> and report this upto but not including the Serial#...
Hardware Overview:
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 6 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version (system): 1.21f4
A Backup or clone is always best to have, unless you can afford to lose everything & start over.
Depends what you need the graphics app to do, but GraphicConverter has a powerful Browse Folder function, & many tools for manipulation, & you can keep your Pics wherever you want, there are older versions that.ll work for 10.5.8...
http://www.lemkesoft.com/
Sorry, no experience with iPhones or even cell phones.

Photoshop CC on MacBook pro OS X 10.9.4 has 8GB Ram 2.4 GHz Intel Core i5 and 512 MB VRam OpenCL still not working

Hi
I have a Macbook Pro 13 inch Late 2011 have upgrade my Ram to 8 GB so that the VRAM is now 512 MB, and running OS X 10.9.4 but still no OpenCL
Help ?

Hi
I have a Macbook Pro 13 inch Late 2011 have upgrade my Ram to 8 GB so that the VRAM is now 512 MB, and running OS X 10.9.4 but still no OpenCL
Help ?

PS CC '14 not properly recognizing vRAM?

I'm sorry if this has already been asked. I tried to click on a couple of links for troubleshooting GPU problems, but got an error saying the page was not available. I had PS CS6, which worked great. I recently made the switch to CC 2014 and now it gives me an error when I open a file saying I need at least 512MB of vRAM and that it is not detected on my system. Certain features are shut off because of this. I have an Nvidia 750 Ti (EVGA SC) 2GB. I've looked and looked and I can't seem to find an answer to this specific problem. It has never worked properly with the original drivers or updates since then. I've adjusted settings in the Nvidia control panel to try and optimize it for Adobe and nothing seems to help, no matter what changes are made.
Running Windows 7 Ultimate (64).
Anything I can do??? I'm about to just switch back to CS6. CC also won't let my Intuos4 rotate the canvas either. At this point it seems like more hassle than it is worth, but I thought I would ask.
Thanks.

When you launch Photoshop, Photoshop launches a console app called the sniffer, which pokes at the GPU hardware and reports its result to Photoshop. Photoshop will always dump the sniffer's diagnostic information into a file called sniffer-out.txt in the Photoshop settings folder.
On Win: C:\Users\khopps\AppData\Roaming\Adobe\Adobe Photoshop CC 2014\Adobe Photoshop CC 2014 Settings\sniffer-out.txt
Of course, replace khopps with your own username to find this file. If you are able to find the file, please send it to me at khopps at adobe dot com.
I should be able to get some information from it.
Thanks,
Kevin

How different is Windows Vista run on Macbook Pro with 128MB and 256MB VRAM

Hi guys,
I am going to buy a MacBook Pro soon. But I am struggling picking the right model for me due to that I am not sure how differently Windows Vista is run on them.
I don't use much CPU intensive programs. CPU power is not an issue to me. RAM? I will install 2GHz of it regardless which model I will buy. The only thing worries me is the VRAM.
I would love to have smooth experience with the Aero effects. So how much will the difference in VRAM really make?

At this time Windows Vista is not fully supported by using Apples Boot Camp program. It has been done but people that I personally know that have done it have not much success. I currently am running Windows Vista (non beta) in a parallels session and it runs quite nicely. But I don't get the Aero effects. I would certainly suggest 256MB VRAM Microsoft suggests 128 and their suggestions are for minimal performance. 256 will give you the best performance. Hope this helps.
PS Welcome to Apple Discussions.

VRAM DIMM

I have a Power Macintosh 7200/90 that I got on EBay I am upgrading the Ram on it, I opened up the case last night to see what was inside if there were any empty slots. There are 4 stick 2 look like normal ram but the other 2 I discovered this morning as I was looking on eBay look like VRAM DIMM, they are very thick and look like a picture that I found on eBay of VRAM DIMM. Is it possible for these to be in the DRam slots instead of the VRam slots would the computer still work? Also is it possible for me to use memory from a Ruby IMac G3 DV? I have two 68 mb sticks that I took out of my IMac that I hate to waste.
Apple iMac DV G3/400 Ruby Red & Power PC Macintosh 7200/90 Mac OS X (10.0.x) 400 MHz PowerPC 750, 128 MB ram, 20 GB Hard Drive, Slot Loading CDROM

I see.
Some older DIMMs are "fatter" than we see today. I can't say for sure if that makes them VRAM. The computer may run with VRAM in the RAM slots (assuming they have the same pin layout) but they would certainly not be recognized. It is more likely that the computer would not boot, giving the "breaking glass" sound instead of the normal startup chime.
When you get the computer open tonight, shine a light into the RAM and VRAM slots (reference the logic board diagram. Slots have bars every so often that "key" them for the right RAM. The RAM sticks have corresponding notches to clear the bars for full insertion. I doubt that RAM and VRAM for the same computer would have the same pattern of bars.
The RAM from the iMac will work in Beige G3s, Blue & White G3s, and early G4s--any Mac with a system bus speed of 100mHz or less, except the early eMacs. Even though they had a 100mHz bus, they have to have 133 speed RAM for some reason.. That iMac RAM is called "DRAM" and is a more evolved type than that used in older Macs.

I updated to Adobe cc now my vram is insufficient, how do I address this

Is there a way to increase the VRAM what do I do to meet the required specifications for Adobe CC?
Model Name:          iMac
Model Identifier:          iMac10,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          3.06 GHz
Number of Processors:          1
Total Number of Cores:          2
L2 Cache:          3 MB
Memory:          8 GB
Bus Speed:          1.07 GHz
Boot ROM Version:          IM101.00CC.B00
SMC Version (system):          1.53f13
ATI Radeon HD 4670:
Chipset Model:          ATI Radeon HD 4670
Type:          GPU
Bus:          PCIe
PCIe Lane Width:          x16
VRAM (Total):          256 MB
Vendor:          ATI (0x1002)
Device ID:          0x9488
Revision ID:          0x0000
ROM Revision:          113-B8030F-260
EFI Driver Version:          01.00.383
Displays:
iMac:
Display Type:          LCD
Resolution:          2560 x 1440
Pixel Depth:          32-Bit Color (ARGB8888)
Main Display:          Yes
Mirror:          Off
Online:          Yes
Built-In:          Yes
Connection Type:          DisplayPort
any help greatly appreciated

I just went to the Adobe site to check the mimimum system requirements.
While 512 VRAM GPU was listed as a min. and Adobe prefers a 1 GB VRAM GPU, you might get away with what you have. It may just be 3D rendering time maybe slower. It doesn't mean your iMac won't process the 3D content.
That stated, most users do not always have the financial means to purchase/upgrade their computers when software version requirements change.
If users' conputers meet most of the new software version requirements, some users will just deal with whatever limitation their computer has as long as the software functionality will still operate.
If you have the means to upgrade to a new or newer, more powerful Mac to meet all of Adobe's CS6 version hardware specs, then by all means go out and purchase a new or newer Mac!
Good Luck!

Vram?

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