FFT express VI: maximum possible clock speed

I'm using the FFT express VI in an FPGA VI running on a PXIe-7962R. The maximum clock speed I can use without getting timing errors on compilation is 125 MHz. Is this about right for this VI? I see that the Xilinx LogiCORE FFT has much faster max. clock speeds listed - > 300 MHz for most configurations. Would I be able to achieve a significant speed increase by switching to the Xilinx IP module, or are there other timing considerations specific to LabVIEW FPGA that would slow it down?

Hi Bob,
125 MHz does sound about right for the FFT Express VI. You may be able to increase that a bit by adjusting the Clock rate, Throughput, and Length parameters, but you definitely won't be able to get it up to 300 MHz as you mentioned. Based on the Xilinx LogiCORE FFT documentation, it does look like that could be a faster solution. Have you tried compiling with that method? What clock rates were you able to compile. Also, what rate are you trying to reach?
Thanks,
Morgan Sweatt
Applications Engineer
National Instruments

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Hello,
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So then I chose 2 x to see if that would work.
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Maybe I will try 1x next.
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Not sure if it is different in your version of OS X, but in 10.3, you can go to Applications -> Utilities then run the Terminal application. At the prompt type in drutil info and hit return. This should give you all the info on your optical drive including who is the manufacturer and model number. With those two last bits of info, you can simply do an internet search and find info on your drive including maximum burn speed.
As to in your system, the maximum burn speed will be whatever is ranked lower, the drive speed or the media (blank speed). So if your drive is 8x and your media is rated 4x, then theoretical max speed is four times. Of course it could end up even lower if, for example, your drive does not understand the speed rating on the media you bought, it which case it would likely then default to 1x speed.
I think if you pull up, again speaking in terms of Panther here, the activity console one of the logs will tell you what speed was used. I am not at home right now, so I can not actually dig through my computer to tell you exactly where to look.
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CPU Clock speed with Belle Update

The original symbian^3 devices run on the ARM 11 Processor which has been optimized to function close to 1GHz. But they're currently running at a speed of 680 MHz. My request to Nokia is that please optimize our processor speed to atleast 1GHz with the upcoming belle update. If you haven't planned on doing it, please do it with a minor update atleast after you release belle. I'm not an expert on this. So suggestion and comments are welcome.
blitZkid
Nokia C7: Running on Nokia Belle
"If I'm helpful in anyway, a click of appreciation on the star would be nice"

bumblebirra wrote:
I would be surprised if the rest of the hardware in the phone, like the RAM etc, couldn't support the maximum CPU clock speed. When such sophisticated electronic devices are designed it's impossible to know until it's all been put together how it will actually perform as a complete unit - the hardware, software, battery capacity, etc. The clock speed allows a fine-tuning once everything comes together, to get the optimal balance.
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A GPU is only there to perform tasks that would otherwise take up huge amounts of CPU resources. Dedicated graphical tasks such as 2D scrolling, 3D texture-mapping/filling for example. But that's all. The CPU is still running the whole show, but just has much of the load taken off it by the GPU.
So with the GPU doing more and more, the CPU and it's speed become less relevant.
A few things here, some of what you have mentioned I agree with. But some I dont. Firstly when any device is designed, things like the GPU and RAM are all allowed for, that is the speed at which each is capable. There is no use taking pot luck saying oh we think that will be enough. Its all calculated right from the word go.
Its done for several reasons, firstly costings, there is no use producing something that is so expensive no will be able to afford it. secondly to make sure you dont end up with bottle necks in data flow. Also it no use producing something that is so slow that you cant do anything worthwhile on it. That is some of the reasons.
You are absolutely right about software, well made software installed in a relatively slow running device can quite often beat poorly designed software running on a fast machine at exactly the same task. O/S like windows for instance, in my opinion only, whilst full of features, is definitely bloated, and not well designed. A standard install disc for windows these days is around the 3Gig mark (depending on version of OS), where as something that does exactly the same thing like Linux still fits on a 700M cd.
And you are right about the GPU, its does relieve the pressure on the cpu. Unfortunately the gpu in an N8 or an E7 is only running at 200Mhz. Considering most things are graphical based on these phones. I would have to wonder how much of the gpu is being used, especially when the one chip is running everything from the 2d/3d graphics/rendering, the camera up to 12MP, HDMI, HD video recording and play back, a stack of video codecs etc.
Unfortunately the main cpu from everything i was able to find is simply listed as an ARM11, these processors run on several Nokia's phone, including the older E90 (which had dual cpu's but ran at much slower speed of about 332 Mhz., however the Arm site list the ARM 11 as several versions, including one that actually has 4 cpu on the one the chip but only presents itself as 1 cpu to the rest of the hardware, with this cpu running anywhere up to 1Ghz. So its entirely possible that the 680Mhz listed for the N8/E7 could be as fast as it goes. Also the current versionof the ARM11 have a power consumption of 0.21mW/Mhz. so based on that figure a processor running at 680Mhz would consume 142.8 mW, but at 1G it would be 210mW, that a difference of 67.2mW. That would mean your phone would go flat a lot quicker. This info is based solely on information that I can find on Nokia run sites, ARM's site and broadcoms site. That way we can beleive what we are able to read with some certainty. I did find other non-related site suggesting 720mhz for the cpu, but they are only a 3rd party mobile news site, that said it had been suggested that it was capable of 720Mhz..
But i do firmly believe with efficient code the phones can perform extremely well, Anna certainly seems faster than the old Symbian ^3 version that was on the phone prior to Anna, whether or not Belle can be made any more efficient remains to be seen. But heres hoping.

Quadro 4000 owners - Clock speed at maximum with Premiere or After effects

Hey guys,
I just upgraded my Quadro 2000 to a 4000 (latest driver 311.35, and I'm wondering if all your clock speeds jump to maximum when running premiere or after effects? Even if no editing or playback is going on and GPU load is at 0%? Or do they they throttle down when idle? I'm using GPU-Z to check.
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Hi Everyone!
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Hi Chris,
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ah right, so it also says the maximum clock speed is 3000 mhz , so with overclocking can my processor achieve this? i have 1 mb of l2 cache.
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3. SPAM version(I have no access to SPAM transaction)
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Hi there
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Hi,
Have you read:
http://www.amd.com/en-us/innovations/software-technologies/turbo-core
"AMD Turbo Core technology dynamically adjusts to give you a performance boost just when the operating system requests the highest processor performance. If a core is operating below maximum limits and your workload demands additional performance, the processor frequency will dynamically increase until the upper limit of frequency is reached. As your workload subsides, the core returns to normal frequency. This gives you optimized application performance within the thermal and power limits of your APU."
Your machine:
http://support.hp.com/us-en/document/c04445368
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**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

Re: helix CPU speed stuck at low clock speed

Admin edit - Reorganizing this thread slightly as we are actively investigating the symptoms being discussed here. Several different low end clock speeds of 600-800mhz are being reported capped under a variety of circumstances - sometimes cold boot, sometimes after suspend / resume or dock / undock
motku wrote:
Same here (helix ci7), after suspend and wakeup when CPU slows down ist get stuck at 750MHz and dose not recover untill reboot.
Before the BIOS update I could unplug the AC adapter and work with full speed on battery.
I have the exact same issue. It is quite annoying.
Solved!
Go to Solution.

Mark, theres more.
I found a "pseudo workaround" of this problem and hope this could lead to the real workaround.
What helped - installing win7, lenovo power manager, change power plan to other and change back to previous)
I tried to do some research and what i found:
In normal Lenovo power manager wheres 2 options in power plan:
System perfomance (Maximum turbo, Turbo, Balanced, Low) (lets call it PERF) and Optimise fan control to (Maximize perfomance, Balance all parameters) (lets call it FCNTL.
In theory FCNTL must control only fans, like table of data cpu temperature/fan speed. But in reality it affects CPU speed.
Only way to make PC always select speed from lowest to highest is to set PERF=Maximum turbo or Turbo, FCNTL=Maximize perfomance.
Lets go through options how they really works in practice:
PERF
Maximum turbo and Turbo are equal, means highest speed for CPU with turbo boost. The level of turbo bust is always maximum, Turbo didnt mean "slow turbo boost".
Low - cpu always at lowest speed 800mhz - thats ok.
Balanced - this option works a little crazy. In some situations it means "maximum cpu till 63C", in some situations it means "lowest speed, temperature doesnt matter. Why is it working in different ways but in same settings i dont know.
In theory Balance is something like "from lowest cpu speed till normal cpu speed, no turbo boost", but it doesnt work like that at all.
FCNTL
Maximize perfomance - in theory it must be "try to keep CPU on lowest temp when high load"
In practice its like "Balanced in PERF" - logic is unknown.
Balanced - the same, logic is unknown.
Unknown really means, that when i, for example, setup PERF=Maximum turbo or turbo and FCNTL to Balanced, sometimes it works in full speed and sometimes not.
Maybe there is logic, but it tottaly unknown to users.
The bad thing is that theres no way i can set mode "always run cpu from lowest speed till highest speed without turbo boost, 800-1800mhz".
By the way, there is some error in Lenovo power manager - when i change options in power plan and click "apply", sometimes they a apply, and sometimes not. If not, i need to select other power plan, and then select the needed one back.
Now about how this all can happend. I'm not shure that i'm right, but logically it is:
In Lenovo power manager theres option called "Optimise fan control to". And, there is NO such option in real windows power plan, so, it can be only changed through Lenovo power manager. As i see, this option affects maximum cpu speed. So, lets say, if this option is "damaged" some way, theres no way it can be fixed in windows 8, because Lenovo power manager for windows 8 has too few options, and native windows power plan editor doesnt have this option at all. So, when i done "something" in Lenovo power manager for windows 8, it changed that setting and all ruined.
Sorry for my bad english once more, hope you can understand what am i trying to say. Looks like we have 1) an error in power manager for win8 and 2) incorrect power option logic, or "specific" logic without a manual.
The strange thing, that in BIOS we have this options too. But changes in BIOS doesnt affect this at all.
P.S. by the way, when i got my helix, dock battery was having "wear level" = 1%. Now, after 6 days (battery info 5 cycles) it has "wear level" = 2%. Is it normal, or battery is bad?

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Quote from: DX2 on 20-May-06, 05:53:54
but when I transfered the two memories on DiMM 3-4 it only reads them 185Mhz on the BIOS and which confuses me. when I checked the manual it doesn't suppose to lessen the clock speed total to 333Mhz but still should come up to 400Mhz
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In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
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Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

FFT express VI: maximum possible clock speed

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