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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 1595

post #15941 of 38701
Quote:
Originally Posted by ChrisTahoe View Post

Sure did. Locked up my system as expected. Also gave me back the not downclocking on the second card issue again.... mad.gif
Edit: No longer locks up my system when opened, and MSI AB shows both cards downclocking correctly.
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.
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post #15942 of 38701
Quote:
Originally Posted by PcG_AmD View Post

Lol that's why I'm asking here the forum I trust the most.smile.gif
I won't be dramatic if there is a 2% difference,not at all I was just asking cause I wasn't sure.
Now ill just get another 7950.


I was referring to Anandtech, they be very dramatic. I don't read their site nor Guru3D, too much bad info.
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post #15943 of 38701
Quote:
Originally Posted by Ukkooh View Post

You can replace the fans on the cooler or switch the whole cooler to a aftermarket one. Both break the warranty however so you should just send it back.

That's what I though. Oh well, I'll box it up then. Thanks.
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post #15944 of 38701
Was having problems getting much performance out of my crossfire set with my old processor. Was getting 50% gpu usage in metro and 60-70 in bf3. Resulting in frames as low as the 50s in large scenes (such as in a helicopter).

I upgraded my I7 930 to a 3570k and OCd it to 4.6ghz. Still not getting more then 50% in metro and 60-70 in bf3 resulting in the same frames. So pissed with this. I don't expect to see numbers below 90 fps in bf3 and 99% gpu usage. Starting to think this isnt a cpu issue.
    
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post #15945 of 38701
Quote:
Originally Posted by Bluemustang View Post

Was having problems getting much performance out of my crossfire set with my old processor. Was getting 50% gpu usage in metro and 60-70 in bf3. Resulting in frames as low as the 50s in large scenes (such as in a helicopter).
I upgraded my I7 930 to a 3570k and OCd it to 4.6ghz. Still not getting more then 50% in metro and 60-70 in bf3 resulting in the same frames. So pissed with this. I don't expect to see numbers below 90 fps in bf3 and 99% gpu usage. Starting to think this isnt a cpu issue.

sounds more like a chipset/XFire issue.

which slots do you have the cards in?

the bottom x16 is only 4X - PCIe2.x , and shares bandwidth with the the other 1x slots

the top x16 is PCIe3.0 16x

the mid x16 is PCIe3.0 8x.

every review I read said this board is not a good choice for XFire or SLI.

I'll have to download the manual and give it a read,

but Both PCIe3.0 x16 Slots even in 8x Mode should be enough to run both cards at max.

..

on my 7950OC, running at 1Ghz, i get 75fr/s average on Caspian Border in a chopper at altitude looking down at the entire battlefield, only when Im running 1 screen though, in eyefinity, it drops to 45/50, so I drop some of the GFX Details to maintain vsync.

2 Cards in XFire should be able to drive BF3 on a Single display at max settings with ease.
Edited by SkateZilla - 9/18/12 at 10:40am
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post #15946 of 38701
Quote:
Originally Posted by SkateZilla View Post

sounds more like a chipset/XFire issue.
which slots do you have the cards in?
the bottom x16 is only 4X - PCIe2.x , and shares bandwidth with the the other 1x slots
the top x16 is PCIe3.0 16x
the mid x16 is PCIe3.0 8x.
every review I read said this board is not a good choice for XFire or SLI.
I'll have to download the manual and give it a read,
but Both PCIe3.0 x16 Slots even in 8x Mode should be enough to run both cards at max.
..
on my 7950OC, running at 1Ghz, i get 75fr/s average on Caspian Border in a chopper at altitude looking down at the entire battlefield, only when Im running 1 screen though, in eyefinity, it drops to 45/50, so I drop some of the GFX Details to maintain vsync.
2 Cards in XFire should be able to drive BF3 on a Single display at max settings with ease.
Why?
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post #15947 of 38701
They're in the first 2 of course. PCIE 3.0 at x8 is the same bandwidth as 2.0 at x16.
    
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post #15948 of 38701
Quote:
Originally Posted by tsm106 View Post

I was referring to Anandtech, they be very dramatic. I don't read their site nor Guru3D, too much bad info.

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.
 
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post #15949 of 38701
Quote:
Originally Posted by sena View Post

Why?

the lower spec Z77 chipsets have too many shared bandwidth options/slots/ports
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Quote:
Originally Posted by tsm106 View Post

Quote:
Originally Posted by PcG_AmD View Post

Lol that's why I'm asking here the forum I trust the most.smile.gif
I won't be dramatic if there is a 2% difference,not at all I was just asking cause I wasn't sure.
Now ill just get another 7950.


I was referring to Anandtech, they be very dramatic. I don't read their site nor Guru3D, too much bad info.

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.
Edited by borandi - 9/18/12 at 11:28am
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