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HD 7970 Question

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  • Tom's Hardware
  • HD
  • Graphics
Last response: in Graphics & Displays
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Anonymous
June 1, 2013 11:59:15 AM

Hello again Tom's Hardware!

I recently purchased a Sapphire Vapor-X HD 7970 GHz Edition and am loving it!
I did however just realise that my MoBo (ASUS P8P67) only supports PCIe 2 while my GPU supports PCIe 3. I am curious as to how much performance (gaming wise) I will lose due to having this older motherboard?

Also as a side note.
I like to keep my computer running nice and cool and hence tend to have my fan speeds rather high (noise doesn't bother me and I have headphones)
Will higher fan speeds damage my GPU at all?

I tend to have it on 50% until 40C (idle is 27C) then increase by 10% every 10C until 100% at 70C (My card has yet to go above 55C)

More about : 7970 question

June 1, 2013 12:06:58 PM

PCIe speeds wont affect it at all, don't worry about it. The higher fan speeds are fine but a bit pointless, a 7970 is totally safe up to 80C.
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Anonymous
June 1, 2013 12:09:25 PM

cookybiscuit said:
PCIe speeds wont affect it at all, don't worry about it. The higher fan speeds are fine but a bit pointless, a 7970 is totally safe up to 80C.


Okay, thanks mate :-P
May I ask what PCIe does then?
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June 1, 2013 1:15:36 PM

Well if you were to run PCIe 3.0 in SLI/Crossfire over PCIe 2.0, potentially it would be faster. This is because when a system is running 2 cards the slots are forced to run 8x/8x, rather than 16x. Unless you are using two cards it really doesn't make a difference.
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Anonymous
June 1, 2013 1:38:39 PM

cookybiscuit said:
Well if you were to run PCIe 3.0 in SLI/Crossfire over PCIe 2.0, potentially it would be faster. This is because when a system is running 2 cards the slots are forced to run 8x/8x, rather than 16x. Unless you are using two cards it really doesn't make a difference.


Thanks for your help man :-) :-)

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November 25, 2013 4:05:24 PM

cookybiscuit said:
Well if you were to run PCIe 3.0 in SLI/Crossfire over PCIe 2.0, potentially it would be faster. This is because when a system is running 2 cards the slots are forced to run 8x/8x, rather than 16x. Unless you are using two cards it really doesn't make a difference.


I have a related question as I have the same mobo and want to get a pair of 7970s to crossfire for ltc mining. Do you think I'd get a bad enough performance hit on 8x+8x on 2xPCI-E 2 to maybe warrant different cards?
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