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GPU Question

post #1 of 19
Thread Starter 
So I have been looking around at different GPU's for a new build and my question is how can you tell by looking at an advertisement if a certain GPU can be overclocked or not (sorry I don't know much about GPU's) all I ever look at is the cpu speed and memory speed.
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post #2 of 19
They can all be overclocked using MSI afterburner or the like

Comps
post #3 of 19
Thread Starter 
ok cool thank you, all so I was wondering is there a big difference in using 1 PCIe x16 slot or 2 PCIe x8 slots or should I find a mobo with 2 PCIe x16 slots?
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post #4 of 19
if your running sli/crossfire the difference between x16 and x8 is not noticeable at all even in multi gpu setups at most youll notice a 1-2 fps difference if that honestly i doubt youll even notice it

when i ran my 5770s in crossfire i did it on x16 and x4 and the only difference i noticed going to x16 x16 was in benchmarks
post #5 of 19
Thread Starter 
well the mobo I am looking at is this:

http://www.newegg.ca/Product/Product...82E16813157240

but the way Newegg has the ad I can't figure out if there is more then 1 PCIe x16 or I'm not reading it right
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post #6 of 19
basicly how i read it, it says how they run in what mode with x amount of gpus installed

1 GPU - x16
2 GPUs - x8x8
3 GPUs - x8x8x4

edit it looks like after re reading the bottom slot is always x4
post #7 of 19
Thread Starter 
added rep to both of you thank you for clearing that up for me.
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post #8 of 19
Every GPU is able to be overclocked, its just how far, each GPU is different due to different Vendors, coolers, PCB's, Power phases, quality of components. And I have experimented with PCIe lanes, I tried, 8x/8x and 16x/4x and 16x/16x. 16x/16x is obviously the best with less restriction but I found 8x/8x to be better than 16x/4x. I would assume that is because both the GPU's were evenly splitting the the load, but with heaven benchmarks, I saw 5-8 FPS difference between the tests.
 
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post #9 of 19
ASRock P67 Fatal1ty board has 3 PCIe x16 Slot.
But the bottom slot only works at x4 mode.
Top and middle works at x16 mode if only use one of them.
If you use the top and middle slot together, they will work at x8 mode.

For Radeon HD 5770, it won't be a problem if it runs at PCIe x8 because it does not need much bandwidth. Are you looking for new Graphic Card as well?
Radeon HD 6900 series will be taking noticeable performance hit if they run at PCIe x8.
    
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post #10 of 19
Yea, either using sapphire trixx, msi afterburner, or simply ccc overdrive, you can oc your card. Although a lot do have some inherent problems. A lot of people complain of AB messing with their bfbc2 gameplay, and some say with trixx they can't use the powercontrol settings in ccc.

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