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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 3563

post #35621 of 38704
I crossfire 2x7950's in a corsair 800d. You're always gunna have problems with the top card on air because of it sucking up hot air from the bottom card. I did the red mod on both cards and have never been happier. 1200/1600@ 1.250 and temps on both cards never exceed 50 celsius. Vrm's are in the upper 60's to mid 70's. Instead of the top card being 15 or 20 degrees hotter they are both within a degree or two of each other.
post #35622 of 38704
The 800D is notoriously terrible for air cooling.. Newegg will come to the UK in a couple of months.. Anyways, just don't sell cards there because it tends to be a mess, they will brick the card and demand money 99% of the time...
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post #35623 of 38704
Quote:
Originally Posted by X-Alt View Post

The 800D is notoriously terrible for air cooling.. Newegg will come to the UK in a couple of months.. Anyways, just don't sell cards there because it tends to be a mess, they will brick the card and demand money 99% of the time...

Yea.. I switched to corsair 800d from antec 1200 when I built a custom loop for my cpu. Gpu's got the red mod because I already had both of the AIO'S. But yes. 800d is horrible for air. Pretty decent for water though.
post #35624 of 38704
Quote:
Originally Posted by X-Alt View Post

The 800D is notoriously terrible for air cooling.. Newegg will come to the UK in a couple of months.. Anyways, just don't sell cards there because it tends to be a mess, they will brick the card and demand money 99% of the time...

Thats good news on newegg, ebuyer and scan over here are pretty good.

Ya, you run that risk, but I have sold bits on ebay before and even when a buyer has tried to be a scamming ****, paypal has backed me up. I do try to avoid ebay over the fee's so I use gumtree.

Think I'm going to keep my 7970's after all.

The Crosshair V Formula-Z AM3+ you gave me the link to earlier, will that not just have the same issue with the PCI slots not being far enough apart to leave descent air space as my current cards? Or are all those PCI slots x16? so you can put the cards in the top and bottom ones and leave the middle empty and just get a longer crossfire bridge?

My M5A99FX PRO R2.0 has four slots, I am currently using the two blue as it states there the x16 and thats what i should use for crossfire, if I use the top Blue x16, and the bottom black x4, would it drastically effect the performance, please excuse my ignorance!

post #35625 of 38704
Quote:
Originally Posted by Pookie View Post

Quote:
Originally Posted by X-Alt View Post

The 800D is notoriously terrible for air cooling.. Newegg will come to the UK in a couple of months.. Anyways, just don't sell cards there because it tends to be a mess, they will brick the card and demand money 99% of the time...

Thats good news on newegg, ebuyer and scan over here are pretty good.

Ya, you run that risk, but I have sold bits on ebay before and even when a buyer has tried to be a scamming ****, paypal has backed me up. I do try to avoid ebay over the fee's so I use gumtree.

Think I'm going to keep my 7970's after all.

The Crosshair V Formula-Z AM3+ you gave me the link to earlier, will that not just have the same issue with the PCI slots not being far enough apart to leave descent air space as my current cards? Or are all those PCI slots x16? so you can put the cards in the top and bottom ones and leave the middle empty and just get a longer crossfire bridge?

My M5A99FX PRO R2.0 has four slots, I am currently using the two blue as it states there the x16 and thats what i should use for crossfire, if I use the top Blue x16, and the bottom black x4, would it drastically effect the performance, please excuse my ignorance!

There will be some performance degradation, but it will be minimal. The 7000 series did not max bandwidth on the PCIE lanes. I am not sure if the same holds true for the 200X series, since they use the lanes for xfire instead of a bridge. I am trying to find the benchmarks to show, but I cant remember where I saw them . Found it http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/
Edited by inedenimadam - 3/28/14 at 3:48pm
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post #35626 of 38704
Would be cheaper to just keep the motherboard you have, buy a seidon aio cooler, go to Home Depot and get some 3mmx25mm screws and nuts and slap it on the top card.. Your top card will be cooler than your bottom card and definitely cooler than it would be under air and a new mobo with more space inbetween. I tried the x16+ x4 on my 7950 crossfire setup for the same reason as you and I did notice the difference in performance
post #35627 of 38704
I think I am disappointed in the R9 290X. I still have to get it waterblocked but its no 7990. I tried it last night and it does not put out the fps that I was expecting. Guess I will have to wait for the RMA trade on my 7990 to R9 290x to try 2 of them in xfire. If any one is interested in a 7990 waterblocked let me know I am thinking 725.00 With shipping.
post #35628 of 38704
What kinda framerate drop are you seeing? I have 7950's in crossfire and was thinking about going with a 290x until I can afford a second one. I run eyefinity setup
post #35629 of 38704
Quote:
Originally Posted by Jflisk View Post

I think I am disappointed in the R9 290X. I still have to get it waterblocked but its no 7990. I tried it last night and it does not put out the fps that I was expecting. Guess I will have to wait for the RMA trade on my 7990 to R9 290x to try 2 of them in xfire. If any one is interested in a 7990 waterblocked let me know I am thinking 725.00 With shipping.

i think you have to oc the 290X 1200 core to match a stock 7990.
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post #35630 of 38704
Quote:
Originally Posted by rdr09 View Post

i think you have to oc the 290X 1200 core to match a stock 7990.

Do you know if that is possible under air. Thanks
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