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GTX 470 Memory overclocking

post #1 of 13
Thread Starter 
Is it necessary? Or ill just OC it a little and focus on the core clock?

Or when is the time I oc the memory?

Cheers

+rep to those who help!
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post #2 of 13
Get as much OC as you can on the core w/ the memory at stock. Once you've maxed that out, then add whatever memory OC you can on top of it. It likely won't be a whole lot, memory typically taps out between 1750 and 1950, I'd guess around 1800 is average on air with a good-size OC on the core.
    
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post #3 of 13
The video memory acts to the GPU as the computer's main memory does to the processor, storing video data and feeding it to the core as needed. The faster the memory goes, the less waiting around the GPU has to do, so overclocking the VRAM also has a major effect on 3D performance.
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post #4 of 13
Thread Starter 
Quote:
Originally Posted by brettjv View Post
Get as much OC as you can on the core w/ the memory at stock. Once you've maxed that out, then add whatever memory OC you can on top of it. It likely won't be a whole lot, memory typically taps out between 1750 and 1950, I'd guess around 1800 is average on air with a good-size OC on the core.
Quote:
Originally Posted by Lampen View Post
The video memory acts to the GPU as the computer's main memory does to the processor, storing video data and feeding it to the core as needed. The faster the memory goes, the less waiting around the GPU has to do, so overclocking the VRAM also has a major effect on 3D performance.

You two have two different points?
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post #5 of 13
Quote:
Originally Posted by Lampen View Post
The video memory acts to the GPU as the computer's main memory does to the processor, storing video data and feeding it to the core as needed. The faster the memory goes, the less waiting around the GPU has to do, so overclocking the VRAM also has a major effect on 3D performance.
The GPU's memory it's actually even more important, perf-wise, than the computer's main memory, because the vram is where the image is 'built' (the frame buffer) ... iow it's a critical part of the actual data pipeline involved in generating each frame. Whereas a CPU can do lots of it's 'stuff' without ever calling over system memory due to it's onboard caches, and the fact that much of what it does is just act as a calculator.

Also, how important a memory OC is depends a lot on the architecture of the individual model of card. A memory OC on a stock 470 doesn't do a whole lot, but when you jack your core up to 850MHz, a memory OC can actually yield some tangible benefits. And if you take a 460 768MB card, with it's powerful core and much smaller 192-bit memory interface, a memory OC on that card is definitely noticeable.
Edited by brettjv - 1/21/11 at 9:32am
    
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post #6 of 13
Quote:
Originally Posted by rocstar96 View Post
You two have two different points?
Brett's referring to how you should OC a card. You start with the core/shaders with the memory at stock and then move on to overclocking your memory. You should do it this way so that if have errors you know which OC was too high/unstable (core+shaders or memory). He also just gave you general guidelines on how far it'll probably be able to go.

I gave a brief explanation on what effects memory overclocking has on performance.

Edit: Brett just added an explanation as well and its quite good. Hopefully it helps explain it all a bit.
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post #7 of 13
Thread Starter 
Quote:
Originally Posted by brettjv View Post
The GPU's memory it's actually even more important, perf-wise, than the computer's main memory, because the vram is where the image is 'built' (the frame buffer) ... iow it's a critical part of the actual data pipeline involved in generating each frame. Whereas a CPU can do lots of it's 'stuff' without ever calling over system memory due to it's onboard caches, and the fact that much of what it does is just act as a calculator.
So core>memory?

EDIT: Then it looks like ill be focusing to get a new PSU. +rep to both of ya!
Edited by rocstar96 - 1/21/11 at 9:33am
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post #8 of 13
It IS important, but it will not yield much higher results. Fps wise will not increase much between +100mhz on core or +100mhz on mem. Maybe because fermi has enough bandwidth and speed so it doesnt need high frequency. Also even if your mem oc is somehow stable try to bench games, if you see decrease in performance lower your mem oc a bit. Fermi has a complex way of communicating with the memory, if the data is corrupted it will send it back = lower fps.
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post #9 of 13
Quote:
Originally Posted by rocstar96 View Post
So core>memory?

EDIT: Then it looks like ill be focusing to get a new PSU. +rep to both of ya!
Yes, on a 470, the way I described is the way you want to do it. Get as much out of the core as you can, then add whatever memory OC on top of that that you can get away with. The core OC is by far the more important of the two, esp. on a 470 which already has a plethora of memory bandwidth. The reason you do the core first is that OC'ing the memory first may jeopardize your ability to get the core as high, which is not what you want.
    
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post #10 of 13
Just keep in mind your already near the limits of the cards capabilities on air/water..W/C'ing will mainly bring a reduction in voltages, more so than increasing headroom for OC.

*dont bother with memory voltage mods either..they are a waste on these cards. IC's are crap.
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