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[Official] The AMD Radeon 7800 Owners Club - Page 138

post #1371 of 4099
Quote:
Originally Posted by warpuck View Post

What I don't under stand is: why the 7870 limit of x2 crossfire?
Do I have one of a few that have only one crossfire connector?
Do any of these cards come with the mini hdmi connectors?

I have a 1000 watt power supply and I want to use all the watts!
I want a desk the will fit 2 more 32' monitors on it too.

NO problems with cat 12.4, 12.6 and beta 12.7 (890fx mobo), that is unless no GPU folding is a problem

Other than that I am quite pleased with the Gigabyte 7870 OC. I removed the wind tunnel fans. 270 watts of amp is back to being overkill,thumb.gif instead of necessary. Wind tunnel fans pulled and the remaining ones dailed down to 50%. Running a single 1080p monitor/TV? no need for more OC.
Now if I could dail down the wife I would be about as happy like a soul sista with 20 benjimans to spend.

I think I understood some of this...

All 7870's have just one XFire fin, though if somebody decides to make a 7870 X2 (Please!), then we may be able to to tri-fire with that.
 
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post #1372 of 4099
Quote:
Originally Posted by Warweo View Post

I think I understood some of this...
All 7870's have just one XFire fin, though if somebody decides to make a 7870 X2 (Please!), then we may be able to to tri-fire with that.

There was a rumour about Asus making a 7870 X2 but they cancelled it

http://videocardz.com/33662/asus-preparing-new-ares-2-based-on-radeon-hd-7870-x2
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post #1373 of 4099
Quote:
Originally Posted by warpuck View Post

What I don't under stand is: why the 7870 limit of x2 crossfire?
Do I have one of a few that have only one crossfire connector?
Do any of these cards come with the mini hdmi connectors?
I have a 1000 watt power supply and I want to use all the watts!
I want a desk the will fit 2 more 32' monitors on it too.
NO problems with cat 12.4, 12.6 and beta 12.7 (890fx mobo), that is unless no GPU folding is a problem
Other than that I am quite pleased with the Gigabyte 7870 OC. I removed the wind tunnel fans. 270 watts of amp is back to being overkill,thumb.gif instead of necessary. Wind tunnel fans pulled and the remaining ones dailed down to 50%. Running a single 1080p monitor/TV? no need for more OC.
Now if I could dail down the wife I would be about as happy like a soul sista with 20 benjimans to spend.

Dunno about the limit, if there is any its something forced through the drivers and is probably related to marketing as I hope you are aware that you do not need a CF bridge for running CF. It works perfectly fine without the CF bridge by just picking it in the drivers. The CF bridge is relatively low bandwidth gadget anyway and especially when running eyefinity majority of stuff moves over PCIe between the cards anyway as the bridge does not have enough bandwidth for Eyefinity resolutions.
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post #1374 of 4099
Quote:
Originally Posted by Carniflex View Post

Dunno about the limit, if there is any its something forced through the drivers and is probably related to marketing as I hope you are aware that you do not need a CF bridge for running CF. It works perfectly fine without the CF bridge by just picking it in the drivers. The CF bridge is relatively low bandwidth gadget anyway and especially when running eyefinity majority of stuff moves over PCIe between the cards anyway as the bridge does not have enough bandwidth for Eyefinity resolutions.
I have heard different story.
Without CFX bridge, performances are about 70-80% lower than with with bridge.
Edited by sena - 8/18/12 at 11:58am
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post #1375 of 4099
Quote:
Originally Posted by sena View Post

I have heard different story.
Without CFX bridge, performances are about 70-80% lower than with with bridge.

Just out of curiosity - where have you heard that ?

I did not notice a noticeable performance drop when I ran 5770 + 6770 in CF without bridge, both were in PCIe 2.0 x8 mode. Granted I don't remember if I was running any benchmarks for finding out or was just keeping en eye on FPS in games, I would guess the latter. So it is quite possible you are right if your source happens to be something that did the proper benchmarks to show the performance drop.
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post #1376 of 4099
Quote:
Originally Posted by Carniflex View Post

Just out of curiosity - where have you heard that ?
I did not notice a noticeable performance drop when I ran 5770 + 6770 in CF without bridge, both were in PCIe 2.0 x8 mode. Granted I don't remember if I was running any benchmarks for finding out or was just keeping en eye on FPS in games, I would guess the latter. So it is quite possible you are right if your source happens to be something that did the proper benchmarks to show the performance drop.
It wasnt page, someone i think here on OCN have mentioned that.
Anyway, just because of curiosity, i will test two HD 7870 without CFX, when i get them.
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post #1377 of 4099
My second card is not in my rig atm as I took it out for making space for that arriving 7870 which I should have in couple of weeks - so cant run the benches for that myself atm.

The performance loss, if it exists, might be affected by the CPU and GFX's card as well. I know that lower end cards don't have CF fingers at all although they can be cross-fired through drivers. Anyway - any performance loss, if it exists, must be related to the increased latency of the PCIe connection as bandwidth wise PCIe is significantly larger than the CF Bridge which is in a nutshell just a modified DVI interface. If I remember correct the CF Bridge bandwidth was roughly the same as PCIe 2.0 x1 link, just presumably lower latency.
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post #1378 of 4099
Thread Starter 
Quote:
Originally Posted by Carniflex View Post

My second card is not in my rig atm as I took it out for making space for that arriving 7870 which I should have in couple of weeks - so cant run the benches for that myself atm.
The performance loss, if it exists, might be affected by the CPU and GFX's card as well. I know that lower end cards don't have CF fingers at all although they can be cross-fired through drivers. Anyway - any performance loss, if it exists, must be related to the increased latency of the PCIe connection as bandwidth wise PCIe is significantly larger than the CF Bridge which is in a nutshell just a modified DVI interface. If I remember correct the CF Bridge bandwidth was roughly the same as PCIe 2.0 x1 link, just presumably lower latency.

Although with the advent of PCI-E 3.0 CF fingers are growing old.
Shnayvetchen
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Shnayvetchen
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post #1379 of 4099
I did notice with 2 6770s that with 12.6 would sometimes Hwmonitor would show a clock speed of 0 on the 2nd card instead of 157 when there was a minimum of apps running. I have a msi 890fxa-gd70 it would not crossfire without the bridge. AMD has not changed this :
http://sites.amd.com/PublishingImages/Public/Graphic_Illustrations/WebBannerJPEG/AMD_CrossfireX_Chart_1618W.jpg.
It is possible that the video card firmware may may change it from the AMD chart.
I also thought that some of the A75-55 & 990 + some 970s chipsets were the only ones that support CrossfireX.
If I have to go with a 990fx & dozer/piledriver for crossfireX, I would just get a 7970 and 2 more 1080p monitors and deal with the cpu bottlenecking. Doing i5K and intel mobo requires just to much cash.
I have a 840t, 960t and 1045t. As far as games go they are pretty much the same.
AMD does 2, 3, & 4 with dozers, I never under stood why they didnt do 3,4,5, & 6 with the thubans.
The MSI board shuts down when CPU draw goes over 130 watts.
My spare 790GX system is where the 1045t lives. 140+ CPU watts is what it was made for. It runs the 1045T at 3.6 and 4.0 turbo. The 890fx would not do that. I am going put the 7870 in it just to see what it will do.
Just for snicks I ran 3 cores with 960T and turbo did work. I could do a stable 4.25 Ghz that way, but 4 cores at 4.0Ghz is better. Not sure what 2 7870s would do with what I have & 2 more monitors.
post #1380 of 4099
Hey gotta question if I am OCing my GPU to 1200/1400 should I set power control in CCC to +20? After ahwile I sometimes get slight artifacts. Its not to often so wondering if this setting would help. Temps are not an issue.

Upgrayedd
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Upgrayedd
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