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AMD Radeon 6990 Club - Page 354

post #3531 of 4103
NEW ATIMAN Uninstaller v. 6.1.3

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post #3532 of 4103
Hey guys, so what are the run downs for overclocking the 6990. I remember the 5970 being quite straight forward and easy to overclock.. is it the same with this one? I cant freaking get the voltage to unlock so I can check it.

running msi afterburner...

edit: also on my dell 30 BF3 at 2560x1600 (ultra) seems to skip a little... hoping the overclock will stop this.
Edited by fshizl - 11/2/11 at 7:39pm
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post #3533 of 4103
Quote:
Originally Posted by xGTx View Post
alright, but I saw previous screens from levesque and xxxfire and I saw something really impressive.. like 24000 gpu score points and well.. it put me to shame since 1100/1420 is practically the same as 1000/1500


btw, as I said b4 I thought giving 4x each gpu would bandwidth bottleneck them but... I might be wrong???
x8 per card (x4 per gpu) would be starving the card. You need x16 per 6990!

Sent from my LG-P925 using Tapatalk
Edited by tsm106 - 11/3/11 at 12:46am
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post #3534 of 4103
Quote:
Originally Posted by fshizl View Post
Hey guys, so what are the run downs for overclocking the 6990. I remember the 5970 being quite straight forward and easy to overclock.. is it the same with this one? I cant freaking get the voltage to unlock so I can check it.

running msi afterburner...

edit: also on my dell 30 BF3 at 2560x1600 (ultra) seems to skip a little... hoping the overclock will stop this.
Use latest MSI Afterburner 2.2.0 Beta 8 then go to settings and check/enable the voltage unlocking selections. That's all.


Quote:
Originally Posted by tsm106 View Post
x8 per card (x4 per gpu) would be starving the card. You need x16 per 6990!

Sent from my LG-P925 using Tapatalk

Don't know what you mean. This is new to me if each GPU in 6990 is in direct link to motherboard PCIe lane.


...
Edited by Ken1649 - 11/3/11 at 1:01am
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post #3535 of 4103
Quote:
Originally Posted by Ken1649 View Post
Don't know what you mean. This is new to me if each GPU in 6990 is in direct link to motherboard PCIe lane.


...
If you put a dual GPU card into a x8 slot, they are sharing the bandwidth, which would be x4 per GPU. With the X58, the x16 slot would split to x8 per GPU. I haven't checked in a while, but I think it does make a difference in benchmarks.
     
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post #3536 of 4103
Quote:
Originally Posted by Ken1649 View Post
Don't know what you mean. This is new to me if each GPU in 6990 is in direct link to motherboard PCIe lane.


...


I do not even know where to begin...
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post #3537 of 4103
If any of you badass 6990 owners (or anyone else viewing the thread for that matter) would care to help out your fellow red brethren, the AMD/ATI folding team could use whatever help you can spare!

http://www.overclock.net/amd-ati/115...-monsters.html
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post #3538 of 4103
Quote:
Originally Posted by Ken1649 View Post
Don't know what you mean. This is new to me if each GPU in 6990 is in direct link to motherboard PCIe lane.
Quote:
Originally Posted by ezveedub View Post
If you put a dual GPU card into a x8 slot, they are sharing the bandwidth, which would be x4 per GPU. With the X58, the x16 slot would split to x8 per GPU. I haven't checked in a while, but I think it does make a difference in benchmarks.
Yeah, where have you been?

From what I know for pass generation 5970, 2 GPUs are not in direct link with motherboard PCIe lanes but thru the PLX chip link.

I am not sure about the bandwidth, unless 2 GPUs are transfering data at full PEX 8647 rate of 5.0 GT/s is bottlenecking PCIe x8 lanes.

If a single GPU card is 10% slower going from x16 to x8. Does that mean for 2 dual-GPU will be 20% slower or remains the same at 10%?

http://techreport.com/articles.x/17986

Quote:
The 5970's dimensions and peak power draw are so ample because the card has to accommodate two copies of what is currently the fastest GPU on the market. This really is "CrossFire on a stick," as we like to say, and the performance potential from such a beast is naturally quite considerable. Situated between the two GPUs in the picture above, under a metal cap, is a PCI Express switch chip from PLX, the same model used in the Radeon HD 4870 X2. This chip can support a trio of PCIe x16 links: one to each of the GPUs and a third to the PCIe x16 slot in the host system.

Like any two GPUs in a CrossFire pair, the 5970's Cypress chips communicate with each other by means of those PCIe links and via a dedicated CrossFire interconnect, as well. Gone is the GPU-to-GPU "sideport" connection that was present on the 4870 X2. AMD says improvements to its drivers and to the performance of its CrossFire interconnect have rendered the sideport link unnecessary, even though the CrossFire interconnect's physical bit rate, at 7.92 Gbps, remains similar.



Quote:
Originally Posted by tsm106 View Post


I do not even know where to begin...

You can begin with what you know. You always know everything


...
Edited by Ken1649 - 11/3/11 at 7:06pm
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post #3539 of 4103
Quote:
Originally Posted by Ken1649 View Post
Yeah, where have you been?

I am not sure about the bandwidth, unless 2 GPUs are transfering data at full PEX 8647 rate of 5.0 GT/s is bottlenecking PCIe x8 lanes. From what I know in the pass generation 5970, 2 GPUs are not in direct link with motherboard PCIe lanes but thru the PLX chip link.

If a single GPU card is 10% slower going from x16 to x8. Does that mean for 2 dual-GPU will be 20% slower or remains the same at 10%?

http://techreport.com/articles.x/17986

Been super busy with work, 4 month old newborn son, plus house remodeling, so I haven't been on here much.

As for the PCIe slot speed, from what I remember reading, the x16 to x8 is not much of any drop in performance. But x8 to x4 will see a reduction. As for the PLX chip by that article, it supports X16 to both GPUs and the host x16 slot (3 way channel), hence why I use a X58 for a dual 6990 setup, so I keep the x16 speed for each 6990. For a single 6990 setup, its not a problem. In theory, if each GPU is using the maximum bandwidth through the slot, it would max out at the maximum speed the slot is rated for, so if the 6990 were to use as much bandwidth the slot offers, it would be seeing a x8 to each GPU if they had to split an x16 slot.
     
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post #3540 of 4103
Quote:
Originally Posted by ezveedub View Post
Been super busy with work, 4 month old newborn son, plus house remodeling, so I haven't been on here much.

As for the PCIe slot speed, from what I remember reading, the x16 to x8 is not much of any drop in performance. But x8 to x4 will see a reduction. As for the PLX chip by that article, it supports X16 to both GPUs and the host x16 slot (3 way channel), hence why I use a X58 for a dual 6990 setup, so I keep the x16 speed for each 6990. For a single 6990 setup, its not a problem. In theory, if each GPU is using the maximum bandwidth through the slot, it would max out at the maximum speed the slot is rated for, so if the 6990 were to use as much bandwidth the slot offers, it would be seeing a x8 to each GPU if they had to split an x16 slot.

Congrats to you.


Yeah I know what you mean but let's leave the PCIe bandwidth to the expert tsm106. Give him sometime to accurately explain it to all of us
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