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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 1596

post #15951 of 38701
Quote:
Originally Posted by PcG_AmD View Post

I didn't know that thanks for the tip.
After looking at the charts again I realized tat the difference between 3.0 x8 and x4 was minimum so I'm not worried now biggrin.gif.

i dont think any of the current flagship SINGLE GPU cards even saturate the bandwidth of a PCIe2.0x16Lane Slot yet, let alone PCIe3.0-16Lanes, which is doubled 2.0x16-Lane
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post #15952 of 38701
Anyone measure the Tahiti XTs die size? Trying to get a shim made for it.
In press releases it's 352mm^2, so roughly ~18.76mm x 18.76mm but in reviews it's 365mm^2 ~19.1mm x 19.1 mm.
post #15953 of 38701
Quote:
Originally Posted by borandi View Post

I'm too dramatic? How so? Edit never mind, thought you were referring to the motherboard section there.
PCIe bandwidth in this case has two different effects:
PCIe 2.0 x16 vs. x8 - the only game this really affects is Dirt3, which loves bandwidth and GPU power.
Using tri-GPU on Z77 - depending on your board, you will have one of two setups.
One: x8/x8/x4 where the first two are PCIe 3.0 and the last one is PCIe 2.0 (because it is routed through the chipset)
Two: x8/x4/x4 which are all PCIe 3.0 and all come from the CPU.
Here are my results with Dirt3 at 2560x1440 on 3-way 7970s:
49824.png
Here we see different types of boards at play. The bottom two use config one, where the PCIe 2.0 x4 really is a bottleneck. The next up is the UP4 TH and UD5, which use config two in the all PCIe 3.0 config. The ones above this use PLX 8747 chips for more PCIe bandwidth. To find out more about the PLX chip, I go into a lot of detail here: (http://www.anandtech.com/show/6170/four-multigpu-z77-boards-from-280350-plx-pex-8747-featuring-gigabyte-asrock-ecs-and-evga), but basically it does to a very small extent affect single and dual setups negatively, but surpases three-way setups barely. For four-way, PLX on Z77 is the only way to do it.

Thanks a lot for the info very useful!

So what I understand from all this is that as long as you have x8 PCI-E 2.0 then your card will not be bottlenecked in most games,maybe some in DIRT 3.Am I right?
 
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post #15954 of 38701
Borlandi is from anandtech?
Quote:
Originally Posted by sena View Post

So looks like there is lot of CFX users with some sort of the lock up, hmmmm.
So when you enter the system you can open GPU-Z, but later when you try, you get GPU-Z?
Also my second card sometimes downlocks, sometimes not.


My system locked up yesterday as well with just single 7970. The sound jammed in a loop and it had to be force resetted.
post #15955 of 38701
There was a new post for Catalyst 12.9 beta drivers yesterday. They seem to work and look the nicest for me out of all of the 12.9 betas so far. Here's the link: http://benchmark3d.com/amd-catalyst-9-001-september-4
I hope they keep these one's in mind for their next final release because they seem to be made overall, better.
post #15956 of 38701
Quote:
Originally Posted by disintegratorx View Post

There was a new post for Catalyst 12.9 beta drivers yesterday. They seem to work and look the nicest for me out of all of the 12.9 betas so far. Here's the link: http://benchmark3d.com/amd-catalyst-9-001-september-4
I hope they keep these one's in mind for their next final release because they seem to be made overall, better.

BETA DRIVERS LOADING NAO.

where have you been all my life since September 4th. hahaha
Edited by D3l7a3ch0 - 9/18/12 at 6:15pm
post #15957 of 38701
Quote:
Originally Posted by disintegratorx View Post

There was a new post for Catalyst 12.9 beta drivers yesterday. They seem to work and look the nicest for me out of all of the 12.9 betas so far. Here's the link: http://benchmark3d.com/amd-catalyst-9-001-september-4
I hope they keep these one's in mind for their next final release because they seem to be made overall, better.

No crashes or any problems at all with the beta drivers?
 
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post #15958 of 38701
Mine are still working fine, even with the finicky Guild Wars 2.
   
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post #15959 of 38701
Quote:
Originally Posted by borandi View Post

For four-way, PLX on Z77 is the wrong way to do it.


X79?
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post #15960 of 38701
Daily system lockups atm...
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