Graphics memory upgrade

Is it possible to upgrade the graphics memory on the new 27" iMACs? They give the option of 1 or 2 GB of memory but is that one of those soldered in components or can memory be added after the purchase?

The graphics options are a custom build option only. The graphics have to be chosen prior to purchase.
True, however, that doesn't mean that that the video card as a spare part doesn't exist. The video is not integrated onto the logic board as it is on other systems like the notebooks.

Similar Messages

Satellite A60: Integrated Radeon 7000 Graphics Memory Upgrade

Hi Everybody!
I was wondering if I could get up to 128MB RAM on my Integrated ATI Radeon 7000 IGP?
Maybe I could upgrade my RAM to 1GB to get 128MB video RAM on my Radeon 7000?
Thanks!
suddste

Hi
It would be very interesting to know the detailed name of your unit Satellite A60-xxx because some models were delivered with the shared memory graphic card and it should be possible to change the memory up to max 64 MB.

Processor and graphics card upgrade for hp dc5100 MT(EF633US)

Can someone kindly tell me a variety of Intel processors and graphic cards which i can install in my pc coz right now i'm using Intel pentium 4 CPU 2.80 GHz and Intel 82915G/GV/910GL express chipset. but i would like to upgrade to a faster processor and a graphics card which can play games which require large graphic memory (eg FIFA 2013,GTA 5.etc)

Hi:
Personally, I wouldn't invest the money to upgrade that PC.
You would be better off getting an off lease newer dc5800 MT or dc7800/dc7900 model that has a PCIe x16 video slot.
The killer for your model is you can only install a PCI graphics card.
Very inefficient and pretty expensive for what you get in return.
After you install the required microcode update, the best processor I know for sure you can install would be the P4 650.
Below is the link to the quickspecs. The supported processors are listed on page 7.
I do not know of anyone who that has installed the 651 or 661 processors and got them to work--even though the specs state they are supported.
You can try the 651 or 661 and if you do, please let me know if they worked for you.
http://h18000.www1.hp.com/products/quickspecs/12145_ca/12145_ca.pdf

Memory upgrade fail - Kernel panic after put old memories back

I People, this is my first post here and unfortunately is to report a problem, not to help friends.
I did an memory upgrade last weekend. After this, he will not boot normally, only in safe mode.
I discovered that they sent me 1333Mhz memories, and my mac (mid 2009) supports only 1066Mhz.
I put the old memories again, however I believe that the system did not recognize.
As you can see below, the system recognizes two modules:
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353237334448302D4348392020
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334648302D4346382020
It is not true, I' using now 2 x 2GB, DDR3, 1067 Mhz (stock)
I tried to reinstall the system, but when I try, I got crash again.
how can I solve this issue?
Interval Since Last Panic Report: 5298 sec
Panics Since Last Report:          6
Anonymous UUID:                    EAEB74C4-4B23-BCC2-1A48-B6FEB255C9FF
Mon Apr 1 16:37:33 2013
panic(cpu 1 caller 0xffffff800e0876ab): "Spinlock acquisition timed out: lock=0xffffff8011bff270, lock owner thread=0x10d9fb0aa, current_thread: 0xffffff801f873000, lock owner active on CPU 0xffffffff, current owner: 0x10d9fb0aa"@/SourceCache/xnu/xnu-2050.7.9/osfmk/i386/locks_i386.c:363
Backtrace (CPU 1), Frame : Return Address
0xffffff80f54fbd10 : 0xffffff800e01d5f6
0xffffff80f54fbd80 : 0xffffff800e0876ab
0xffffff80f54fbdb0 : 0xffffff800e06256b
0xffffff80f54fbf40 : 0xffffff800e0b7f69
0xffffff80f54fbfb0 : 0xffffff800e0ce3d1
BSD process name corresponding to current thread: diskarbitrationd
Boot args: config="\OS X Install Data\com.apple.Boot" root-dmg=file:///OS%20X%20Install%20Data/BaseSystem.dmg
Mac OS version:
12A269
Kernel version:
Darwin Kernel Version 12.0.0: Sun Jun 24 23:00:16 PDT 2012; root:xnu-2050.7.9~1/RELEASE_X86_64
Kernel UUID: 8D5F8EF3-9D12-384B-8070-EF2A49C45D24
Kernel slide:     0x000000000de00000
Kernel text base: 0xffffff800e000000
System model name: MacBookPro7,1 (Mac-F222BEC8)
System uptime in nanoseconds: 8887270925
last loaded kext at 1689458563: com.apple.driver.AppleUSBTCButtons     235.4 (addr 0xffffff7f8f6c7000, size 20480)
loaded kexts:
com.apple.driver.AppleUSBTCButtons     235.4
com.apple.driver.AppleIRController     320.15
com.apple.driver.AppleUSBTCKeyEventDriver     235.4
com.apple.driver.AppleUSBTCKeyboard     235.4
com.apple.driver.DiskImages.ReadWriteDiskImage     344
com.apple.driver.DiskImages.SparseDiskImage     344
com.apple.driver.DiskImages.UDIFDiskImage     344
com.apple.driver.DiskImages.FileBackingStore     344
com.apple.driver.DiskImages.HTTPBackingStore     344
com.apple.driver.DiskImages.RAMBackingStore     344
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.driver.AppleUSBCardReader     3.1.0
com.apple.iokit.SCSITaskUserClient     3.5.1
com.apple.driver.XsanFilter     404
com.apple.iokit.IOAHCIBlockStorage     2.2.0
com.apple.driver.AppleSmartBatteryManager     161.0.0
com.apple.driver.AppleUSBHub     5.1.6
com.apple.iokit.AppleBCM5701Ethernet     3.2.5b3
com.apple.driver.AirPort.Brcm4331     600.15.20
com.apple.driver.AppleFWOHCI     4.9.5
com.apple.driver.AppleAHCIPort     2.4.0
com.apple.driver.AppleUSBEHCI     5.1.5
com.apple.driver.AppleUSBOHCI     5.1.5
com.apple.driver.AppleEFINVRAM     1.6.1
com.apple.driver.AppleRTC     1.5
com.apple.driver.AppleHPET     1.7
com.apple.driver.AppleACPIButtons     1.6
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.driver.AppleUSBMultitouch     235.7
com.apple.iokit.IOUSBHIDDriver     5.0.0
com.apple.driver.DiskImages.KernelBacked     344
com.apple.iokit.IOSCSIBlockCommandsDevice     3.5.1
com.apple.iokit.IOUSBMassStorageClass     3.5.0
com.apple.driver.AppleUSBMergeNub     5.1.5
com.apple.driver.AppleUSBComposite     5.0.0
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     5.0.0
com.apple.iokit.IOEthernetAVBController     1.0.2b1
com.apple.iokit.IO80211Family     500.15
com.apple.iokit.IONetworkingFamily     3.0
com.apple.iokit.IOFireWireFamily     4.5.5
com.apple.driver.AppleMCP89RootPortPM     1.11
com.apple.iokit.IOAHCIFamily     2.2.0
com.apple.iokit.IOUSBFamily     5.1.6
com.apple.driver.NVSMU     2.2.9
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     28.18
com.apple.driver.AppleACPIPlatform     1.6
com.apple.iokit.IOPCIFamily     2.7
com.apple.iokit.IOACPIFamily     1.4
com.apple.kec.corecrypto     1.0
Model: MacBookPro7,1, BootROM MBP71.0039.B0E, 2 processors, Intel Core 2 Duo, 2.4 GHz, 8 GB, SMC 1.62f7
Graphics: NVIDIA GeForce 320M, NVIDIA GeForce 320M, PCI, 256 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353237334448302D4348392020
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334648302D4346382020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.106.98.100.16)
Bluetooth: Version 4.1.3f3 11349, 2 service, 11 devices, 0 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: ST9500420AS, 500.11 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0x24600000 / 2
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0x26100000 / 2
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06600000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8213, 0x06610000 / 7
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x06500000 / 3
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0x06300000 / 2

Hi BGreg,
I already reset the PRAM as you said.
I've cleaned the memory modules as indicated by Linc above.
Today I formatted my harddrive to try a clean install, but system crashs after 5%, 10%.
There is something making me worried:
In one of my tries, I opened the system view to check my actual hardware configuration, and to my surprise, the system shows me 8GB installed. Cannot be. I have 2 x 2GB.
Where my system stores this information? There is a way to reset it? I tried last hour install the snow leopard, that cames with my mac, by DVD, but does not worked too.
Thank you all so far.
Giuliano

LENOVO 3000 N200 LAPTOP graphics memory doesn't exceed 128mb on Windows XP

i have a lenovo 3000 n200 laptop model 0769-a58
it is equiped with mobile intel gm 965 chipset " X 3100 "
under windows vista the graphics memory reads up to 384 mb with shader v. 3.0
while when i install windows xp the graphics memory doesn't exceed 128 mb with shader v. 2.0
i already tried the latest graphics drivers from intel.com & the latest bios driver from lenovo.com
i even upgraded the RAM to 3 GB
i would be thankfull if anyone answers my problem

My guess is that it IS a Vista problem, since other devices
work, and you have tried your new devices on a different
system.
Some one else may have a different solution, but that is
where I would concentrate my troubleshooting.

Memory Upgrade for T61

Hi friends,
I have a T61 7663-xxx system, with 1 GB PC2-5300 667 MHz RAM. My Front Side Bus is 800 MHz ( I think so!), Everest software reports my memory controller is dual channel capable, and ~ 85% physical utilization of RAM. I have a nVidia Quadro NVS 140M 128 MB graphics card, but Everest reports 512 MB ?
I would like to upgrade my RAM, and buy some online.
a) Should I buy a similar 2 GB PC2-5300 RAM for my system for performance boost, running Windows XP 32 bit? If so, should I buy Lenovo RAM only, for maintaining my 3 year warranty intact?
Only ThinkPad and Lenovo memory will assume ThinkPad and Lenovo notebook systems limited warranty
b) What are the other best alternatives for good quality, reliable laptop memory, besides Lenovo?
c) Would it be better if I am able to buy RAM which can match my FSB? Will this have any performance benefit? Do these similar FSB speed RAM exist?
Kindly suggest top memory makers, if any.
I could not find any Lenovo 800 MHz memory from their website.
Kindly help me solve my memory upgrade problem.
I am a mechanical engineering student, hence I don't have any idea about FSB and the like, so I request the learned members to cast light on this area.
Info about reputed online sites in US, with fast delivery will be very much appreciated.
Thanks in advance.
Best Regards,
Raiden
TU Hamburg, Germany
Solved!
Go to Solution.

Hmm. As far as I know, the internal graphics card can't be upgraded. There's some dock you can buy that lets you add a graphics card for use with an external monitor, but I don't know much about it. The cpu is more likely to be upgradeable, but don't attempt unless you know a decent amount about hardware servicing. Also, make sure the cpu will be supported by the motherboard! Best not to buy one with a clockspeed higher than what Lenovo sold (core 2 duo at 2.6 ghz).
Why do you want to upgrade so much? I run 2.1ghz with discrete graphics and 2gb ram under Vista, and it runs beautifully. If you have integrated graphics, then that might be a bit of a pain, but hey, you've got better battery life!
Anyway, I'd look more into de-cluttering your computer to speed stuff up. Remove anything you don't need, especially Lenovo tools that run in the background and you may not need. Turn off search indexing (slower searches, but faster overall performance). There are some nice guides online, if you google "vista tuneup."
Good luck! Enjoy your T61 as it is! It's a lovely laptop

How to set on-board graphics memory of my macbook?

I've installed Arch Linux in my macbook pro (2011 early 13inch).
I've upgraded RAM from 4G to 8G, and in OS X, this doubled graphics memory from 256MB to 512MB automatically.
However, in Arch Linux, the graphics memory is recognized only as 256MB which is original value before memory upgrading.
I wonder if I can adjust GRAM to expand it.

Hum, interesting. I have Intel HD4000 and 16GB of ram. I should have quite a lot of video ram, like 1GB.
It is very, very possible that we do have more video ram but what we are looking at is not telling us what we think it is. I was fairly sure that Intel Graphics did all it's video ram scaling stuff on it's own.
% sudo lspci -v -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device 21fa
Flags: bus master, fast devsel, latency 0, IRQ 42
Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 5000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Last edited by hunterthomson (2013-02-18 09:29:36)

9400 Graphics Memory Allocation

For the GeForce 9400M chip is it possible to increase the graphics memory allocation if I were to upgrade the system memory?
In other words: Does the GeForce 9400M chip and Mac OS Leopard+ support dynamic memory allocation for the graphics memory?
If I increase the system RAM from 2GB to 4GB will the 9400 graphics memory allocation increase from 256MB to 512MB?
(The Intel graphics chipset supported it)

No. The 9400 uses 256 MBs of RAM, no more.

Graphics Memory Issue

Hello Everyone!
I got a MacBook Pro A1278 and when I click to system information I found that my Intel HD Graphics 4000 section says that there is 1024 mb of memory. But as I remember in the past, it says 768 mb or something... But why my memory upgraded to 1024, I haven't even open the computer and upgrade. Could anyone tell me whats going on? My macbook pro is A1278 2012 model OS X Version Mavericks 10.9
Thanks!

OS X Mavericks upgraded the VRAM of the Intel HD Graphics 4000 to 1024 MB in order to improve performance. It's normal, so don't worry about this

Portege M400: How to change the 945GM graphics memory size?

Hi,
Does anyone knows how can i limit the maximum and minimum graphics memory on 945GM Graphics Card (M400).
My goal is to set it FIXED to 128 so that i don't have freezes when video memory changes. It is VERY anoying and is punishing my work (Office 2007 is very eager either on video and main memory).
Thanks,
Filipe

Hello Filipe
It will be interesting to know what you mean under punishing the Office 2007 work.
Anyway as far as I know on Intel graphic card (shared memory) it is not possible to fix graphic memory to some specific value (no BIOS settings and also no any setting in advanced display settings). If you want to use more RAM for graphic I recommend you to upgrade RAM.
Sorry but I dont see any other solution.

Equium M70: Question about graphic card upgrade

Is it possible to upgrade this machine (spec's below) for better graphics preformance? Reading past postings left me with little hope. Any and all sound advice word be very appreciated. Many Thanks, Scott
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.050301-1519)
Language: English (Regional Setting: English)
System Manufacturer: TOSHIBA
System Model: EQUIUM M70
BIOS: Ver 1.00PARTTBL
Processor: Intel(R) Pentium(R) M processor 1.73GHz
Memory: 502MB RAM
Page File: 456MB used, 772MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode
DxDiag Notes
DirectX Files Tab: No problems found.
Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Music Tab: No problems found.
Input Tab: No problems found.
Network Tab: No problems found.
DirectX Debug Levels
Direct3D: 0/4 (n/a)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (n/a)
DirectMusic: 0/5 (n/a)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)
Display Devices
Card name: Mobile Intel(R) 915GM/GMS,910GML Express Chipset Family
Manufacturer: Intel Corporation
Chip type: Intel(R) 915GM/GMS,910GML Express Chipset
DAC type: Internal
Device Key: Enum\PCI\VEN_8086&DEV_2592&SUBSYS_FF041179&REV_03
Display Memory: 128.0 MB
Current Mode: 1280 x 800 (32 bit) (60Hz)
Monitor: Plug and Play Monitor
Monitor Max Res: 1600,1200
Driver Name: ialmrnt5.dll
Driver Version: 6.14.0010.4497 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 2/7/2006 08:56:16, 45697 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a
VDD: n/a
Mini VDD: ialmnt5.sys
Mini VDD Date: 2/7/2006 09:04:34, 1399615 bytes
Device Identifier: {D7B78E66-66D2-11CF-5863-0EDFA2C2CB35}
Vendor ID: 0x8086
Device ID: 0x2592
SubSys ID: 0xFF041179
Revision ID: 0x0003
Revision ID: 0x0003
Video Accel:
Deinterlace Caps: n/a
Registry: OK
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Not Available
DDraw Test Result: Not run
D3D7 Test Result: Not run
D3D8 Test Result: Not run
D3D9 Test Result: Not run

I have Satellite Pro M70. Generally the graphic card upgrade on notebooks is not possible. CPU maybe but graphic card . I really dont believe it.
Can you imagine what happen inside of notebook if the exchange could be possible?

Video/Graphic Card Upgrade

Hello,
I am looking to upgrade/replace my current video/graphic card to new one so that I am able to do video/photo editing (Adobe Photoshop CS6)
I am using Windows 7 Home Premium 64-bit Service Pack 1
Here is my Video/Graphic Card infor:
Adapter: Inter(R) HD Graphics Family
   Current resolution: 1920x1080
   Refresh rate: 60
   Version: 8.15.10.2291 (1/27/2011)
Graphics memory: 1,696MB
Aero status: Enabled
Thanks for your help.

Here are the System Requirements for PS CS6.
The problem that you are facing is, the power supply unit (PSU) in the computer is 300W. Any of the video cards that will work properly with it will not be much better than the Integrated Video. Therefore, it will require a PSU upgrade, as well. I normally recommend at least 500W, but 600W is better for future upgrades. I like Corsair products. Any standard ATX PSU will work.
Now, for a video card. The video card that you buy should be PCI Express x16. A generation 2.0 or 3.0 will be backward compatible, but you will not get full benefit of it. I recommend finding a card that you like and making a template of it. If the card has extra PCIe power connectors, you should add at least 1" to the template. This will help you determine if the card will fit into the space provided. Here is a card the will do what you need. You should definitely make a template to assure that it will fit into the space provided. If not, it will give you a good idea of what you need.
Please click the "Thumbs Up+ button" if I have helped you and click "Accept as Solution" if your problem is solved.
Signature:
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
HP Photosmart 7520 AIO
++++++++++++++++++
**Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
Intelligence is God given; Wisdom is the sum of our mistakes!
I am not an HP employee.

Memory upgrade for L505D

My L505D creeps in Corel Draw just with basic graphics. I have 3GB of RAM installed, would upgrading to 4GB of RAM help with graphics?? Is there anything I can do with system settings to improve graphics card/graphics memory perfromance?? THANKS,

Part of the problem would be the basic graphics. It simply can't redraw the screen as well as a better ATI or nVidia graphics chipset can for a number of reasons.
If you don't post your COMPLETE model number it's very difficult to assist you. Please try to post in complete sentences with punctuation, capitals, and correct spelling. Toshiba does NOT provide any direct support in these forums. All support is User to User in their spare time.

Graphics firmware upgrade not working

Hi, I have a 24" iMac 2008 it requires a graphics card upgrade for installing windows 7 i have 10.7 lion running, but it says on checkingavailable disks that it cannot be installed on this disk as it needs 10.6 any ideas the update says 10.6 or later

I see where you are making an error, the advice letter you pointed to refers to:
Download and install the Graphics Firmware Update 1.0 if you run Microsoft Windows 7 using Boot Camp on your iMac (with NVIDIA GeForce 7300 or 7600 GT) or Mac Pro (with NVIDIA GeForce 7300 GT or Quadro FX 4500) computer.
The early 2008 iMac uses the ATI Radeon HD 2600 PRO with 256MB of GDDR3 memory per
http://support.apple.com/kb/SP485
Therefore your system does NOT need the graphics update you're attempting to download.

Memory upgrade on iMac G3 700, help with system crashes

I tried to do a memory upgrade on my iMac, so I bought two kingston 256 MB PC133 modules, but none will work, the system starts, but hangs in about two minutes after loading the desktop. I went back to use the older memory module wich is an spectek, but I need the upgrade, any ideas?
Thanks!
FedericoMG.
Ps: Sorry about my english... I'm from Argentina... :-P

Hi Federicomg
The iMac 700 G3 should have been supplied with 1 stick of 256mb ram. However which is the correct type i am not sure as the Apple specifications for this model state PC100 whereas my iMac G3 700 graphite was supplied with 256 MB PC133-333 SDRAM
http://support.apple.com/specs/imac/iMacSummer2001.html
Apple profiler from my iMac this is the original supplied RAM from Apple:-
DIMM0/J13: Size: 256 MB
Type: SDRAM
Speed: PC133-333
1) I would re-instal the original ram and open system profiler to see what type the ram is.
2) Keeping the original stick in place add another stick of the new ram and look again in profiler to see if its recognised and again try the second stick to see if there's a problem with one of the sticks.
I am currently running my iMac with a small upgrade of RAM and the additional RAM is 128MB of PC100 and i have noticed the performance improvement since adding the PC100 so it's working and i have suffered no ill effects doing this..
paul..

Graphics memory upgrade

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