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[Explanation] So what is VRM, and VRam

post #1 of 18
Thread Starter 
People tend to confuse VRM to VRam (and do that many times and in many threads), so I'm just making a new topic to make it a bit more clear.

Nothing personal, but its a bit irritating at times smile.gif

So lets start with the easy part. VRam -
These are the little memory chips attached to our GPUs, and the amount of them and side, decide how much memory the GPU has.

Today, each chip contains 125MB of storage.
Meaning if you have 12 of those (Like the GTX 580), you get 1.53GB of storage.
Same with the 570. You have 12 of those, so we get 1.28GB (yeah yeah, don't yell. 125MB = 1024*125).

So this has been cleared.


Now VRM -

VRM is short cut to Voltage regulator module.
This, is what deliver the power to our GPU.
These little thingies, convert the power from the PSU, to a much lower volt in order to keep the GPU in safe working volts.

To simplify, each VRM, receives the 12V from the PSU, cut it, and deliver a much lower volt, around the 1V, to the PSU.
Now that is a lot of work for just one little VRM now is it?

So what nvidia and amd did, was put more VRMs in order to share that load.
Like instead of making one guy lift a 2 ton car, ask 10 guys to do it together.

So lets look at the GPUs of today:
The 580:
gtx580-1-1280x1024.jpg

The 570:
NVIDIA-Geforce-GTX570-PCB.jpg

And the 590:
imageview.php?image=29519

(Thanks to google for finding me the pictures from various places wave2.gif).


If you look closely, you will see that:
The 580 has 6 VRM regulators.
The 570 has 4 VRM regulators (Its the same PCB with less VRM and Vram).
The 590 has 10 VRM regulators (jumbled around it, 5 per GPU).

To this means, that in order to deliver the max 1.2V per GPU, the 580 has the least work done needed per VRM. It has 6, they are strong, buffy, and can take up almost everything.

On the other hand, the 570 only has 4. So they have to work harder, stressed out, and in the end, one of them will cave over the weight of work, say "**** that, I'm out of here!", and blow itself up, taking the whole card with it.

The 590, has 5 VRM per GPU.
So it can go somewhere in between, but in the end, it won't match the strength of the 580, and if you push it too hard, you will blow a VRM, and the card is gone.


Now protection to the VRMs, comes in nvidia from the drivers (if I'm not mistaken, amd put that in the GPU bios, which imo is better).

The protection protects the VRMs from blowing up before they stress out.
The protection usually, doesn't need to kick in when playing, but in benchmarking, it does.
There is a way to remove that protection using GPU-Z, but I don't recommend it unless you know what you are doing biggrin.gif


And that's it, long, but hope you enjoy reading it biggrin.gif
For any spelling mistakes, I appologise befor-hend (wink.gif).
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post #2 of 18
Thanks man:thumb:

You deserve a Rep for this job well done!
post #3 of 18
nice...
post #4 of 18
So Vram is the voltage regulators and Vrms are the ram modules correct?
    
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post #5 of 18
Quote:
Originally Posted by BallaTheFeared;12863719 
So Vram is the voltage regulators and Vrms are the ram modules correct?
Other way around, VRAM = Memory modules and VRM = Voltage regulators.

Btw, Its Yiff from Madoshi.net. smile.gif
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post #6 of 18
thumb.gif and how many phases of VRMs do 480 have?
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post #7 of 18
Quote:
Originally Posted by N3C14R;12863804 
Other way around, VRAM = Memory modules and VRM = Voltage regulators.

Btw, Its Yiff from Madoshi.net. smile.gif

Yeah I know, I was trying unsuccessfully to be funny.

SAMPer?
    
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post #8 of 18
Quote:
Originally Posted by BallaTheFeared;12863940 
SAMPer?
Yeah, but everystuff is dead, no one hardly ever goes on the server anymore.
But I still hang around the forums though.
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post #9 of 18
Thread Starter 
Quote:
Originally Posted by andynolife;12863935 
thumb.gif and how many phases of VRMs do 480 have?


Same as the 580, 6.
The 470 has 4 like the 570, but they are of different make, and imo ended up better than the 570's ones.
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post #10 of 18
Although I already knew this, it is great to see someone taking the initiative to teach the sometimes confusing basics to new-comers to this hobby. Great work and +1 from me
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