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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 164

post #1631 of 38704
Quote:
Originally Posted by Aventadoor View Post

Is there any bandwidth tests with this cards yet?
Im running both at 8x 8x (P8Z68 V-Pro gen 3) but it would be a mehh if it was bottlenecking them for 10fps or even more!

shouldn't. maybe 1-3% max. linus on youtube already proved it. he even tested a 6990 on the x4 slot and it wasnt even that bad
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post #1632 of 38704
Quote:
Originally Posted by jamborhgini313 View Post

shouldn't. maybe 1-3% max. linus on youtube already proved it. he even tested a 6990 on the x4 slot and it wasnt even that bad

This may be true on 6000 series but he was asking about the 7000 series. If you plan on doing quadfire with lets say 2 7990's then 8x might limit you bandwidth wise. Also since these cards are 3.0 I think they will take advantage more from the extra bandwidth of 16x over 8x then the previous generation of cards. Otherwise why would all these heavy hitting x79 boards be switching to 16x this new generation will see bigger gains from it I guarantee you.
 
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post #1633 of 38704

There's no performance hit going from @x16 to @x8, for 6990 or 7970 either in PCIe 2.0 or 3.0.

 

PCI Express 3.0 Has Zero Performance Incentive for Radeon HD ...

[Hardwarecanucks]HD 7970 PCI-E 3.0 vs PCI-E 2.0 comparison

7970 PCIe 2.3 vs PCIe 3.0 - [H]ard|Forum

 

For X79 board, the best available PCIe lanes for multi GPU is @x16/x8/x8/x8. That's the lanes Quad-fire will be running at with X79 board. .

 

There's no @x16/x16/x16/x16 for X79 available yet upto this post is made.

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post #1634 of 38704
Quote:
Originally Posted by Ken1649 View Post

There's no performance hit going from @x16 to @x8, for 6990 or 7970 either in PCIe 2.0 or 3.0.

PCI Express 3.0 Has Zero Performance Incentive for Radeon HD ...
[Hardwarecanucks]HD 7970 PCI-E 3.0 vs PCI-E 2.0 comparison
7970 PCIe 2.3 vs PCIe 3.0 - [H]ard|Forum

For X79 board, the best available PCIe lanes for multi GPU is @x16/x8/x8/x8. That's the lanes Quad-fire will be running at with X79 board. .

There's no @x16/x16/x16/x16 for X79 available yet upto this post is made.

I meant quadfire as in 2 7990's not 4 7970's. The asus sabertooth x79 is dual16x
 
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post #1635 of 38704

Is that opinion or fact that 7990 will have performance hit going from x16 to x8?

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post #1636 of 38704
Quote:
Originally Posted by Ken1649 View Post

Is that opinion or fact that 7990 will have performance hit going from x16 to x8?

I doubt it's fact. I doubt it will personally. (opinion) Next gen mabye will *need* PCI-E3
post #1637 of 38704
Quote:
Originally Posted by PARTON View Post

I'm hitting 31c max and still can't get past 1160 stable. 1090 was the max on air. 57% asic ftw.
This sounds like my card. I went from 1060 to 1130 with adding a water block my card never goes over 35c.
There are at less a 100 cards tested in this thread I don't see anyone with anything solid over 1300 core.
 
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post #1638 of 38704
Quote:
Originally Posted by UNOE View Post

This sounds like my card. I went from 1060 to 1130 with adding a water block my card never goes over 35c.
There are at less a 100 cards tested in this thread I don't see anyone with anything solid over 1300 core.

my card would probably come close under water.
at stock i can get it to 1175mhz. if i open up my window and put all my fans to 100% it brings the card temp down to 55C under load and i can get it to 1200 with 1155mv
post #1639 of 38704
Guess who just went tri-fire....and soon 120hz eyefinity handlebarssmiley.png

700
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post #1640 of 38704
I don't know much about AMD cards.. does overclocking get better as drivers progress? The vdroop is %#%ing ridiculous on this card at load.
    
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