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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 1664

post #16631 of 38701
Quote:
Originally Posted by kahboom View Post

http://www.techpowerup.com/mobile/reviews/AMD/HD_7950_CrossFire/22.html if you overclock there's cards you could easily pull as much or exceed that of a 7970 crossfire cards would not in counting a overclocked CPU draws more power as well plus running fans pump hard drives ect. Its your money if you blow a psu when overclocking it and take out other parts its a lession learned. Avoid ocz power supplys they are worse then dynex or even a rockfish psu.

I have read everywhere that the OZC ZS series are very solid and reliable. Getting good results in all sorts of reviews also. Their ZS and ZX are nothing like their old series, those were crap as far as I know.

These are the mixed opinions I hear on PSU and crossfire in general. People have a lot of different opinions on this. I'd like to hear some more thoughts please smile.gif
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post #16632 of 38701
Quote:
Originally Posted by tsm106 View Post

It seems a lil high given your mild cpu overclock. What was your gpu overclock at the time? Your psu is probably on the weak/failing side because 1100w is only 935w after factoring in losses, thus your psu should have been able to handle that draw and some.
With the gpus at 1000/1425 (stock clocks for my cards) it was pulling just over 1000, somewhere in the 1025-1045 range. Once I turn em up to 1200/1700 I can either run OCCT and instantly shut down or I can play a game like crysis or metro 2033 for anywhere from 5 to 20 mins and it will eventually shut off on me. Not very comforting to know it could be a PSU failing as I just spent around 80$ on some MDPC sleeving and single sleeved the whole thing.
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post #16633 of 38701
Quote:
Originally Posted by SilkyJohnson View Post

Quote:
Originally Posted by tsm106 View Post

It seems a lil high given your mild cpu overclock. What was your gpu overclock at the time? Your psu is probably on the weak/failing side because 1100w is only 935w after factoring in losses, thus your psu should have been able to handle that draw and some.
With the gpus at 1000/1425 (stock clocks for my cards) it was pulling just over 1000, somewhere in the 1025-1045 range. Once I turn em up to 1200/1700 I can either run OCCT and instantly shut down or I can play a game like crysis or metro 2033 for anywhere from 5 to 20 mins and it will eventually shut off on me. Not very comforting to know it could be a PSU failing as I just spent around 80$ on some MDPC sleeving and single sleeved the whole thing.


You should try putting a fan on the psu, give it a lil extra cooling.

7970 at max clocks with +20% = 300w, limit of the pcie spec btw, times 2 = 600w. I'd imagine with your light overclock on the cpu you're only around 200w. At your stock gpu clocks you're no where near that 300w max per card so you're at least closer to 250wx2+200w, bringing it to 700w give or take. That's why I think it's a combo of over-zealous killawatt and failing psu.
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post #16634 of 38701
Quote:
Originally Posted by rck1984 View Post

I have read everywhere that the OZC ZS series are very solid and reliable. Getting good results in all sorts of reviews also. Their ZS and ZX are nothing like their old series, those were crap as far as I know.
These are the mixed opinions I hear on PSU and crossfire in general. People have a lot of different opinions on this. I'd like to hear some more thoughts please smile.gif

I was using Ocz ZT 750 about 2 months ago. Had problems with it twice. Their customer service is amazing. I got a replacement in 3-5 days (depends if it was a weekend or not). I did advance replacement so they charge my cc and send me a new one first before I send them the defective one. The third time I had to rma was due to a faulty cable, instead of sending me another brand new Ocz ZT 750, they sent me a free upgrade, Ocz ZX 1000!
post #16635 of 38701
Anyone know the height of the 7970s pcb. I am lazy and cannot be bothered to remove mine to measure it.

I have a sagging issue and want to buy a Cardkeeper bracket cos that's alarming:
Warning: Spoiler! (Click to show)
Quote:

Edited by BritishBob - 10/12/12 at 9:08am
Don't Push that!
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post #16636 of 38701
I don't think it will damage anything.

But if you think it is alarming,

-You can always buy a backplate for better support.

-Or for easier cheaper solution. Just get a stick with the perfect lenght, I would prefer plastic/black, cut to the exact lenght . Put between bottom of your case (or PSU Cover) and your card / Cooler. Don't put it directly on the PCB.

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post #16637 of 38701
Just bought a new Sapphire 7950 and Im noticing its always swapping between 850Mhz and 925Mhz core clock in game and Im not super happy with the performance so I tried to increase my core to 1000Mhz core in AB but as soon as I change it my in game core clock goes down to like 500-600Mhz and I get half the fps as I did before. Any ideas?
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post #16638 of 38701
Put a part list together for my neighbor and I helped him slap it all together last night, but I thought you all might like this:

3f855623_ChrisDoubeDs.jpeg
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post #16639 of 38701
Today I installed my 7950 TF3 and I seem to have ran into some issues. As I connected everything, it would not...i suppose post? I switched to my onboard graphics and booted properly but it took a bit longer than usual. I checked my device manager and it seems to detect the card and I installed the AMD drivers with no issue. But it seems that I can't actually use the card. Any ideas? I am using a Seasonic x-660 and my other components include an 3570k at stock speeds, 8gb ram, wifi card, ssd and asrock z77 extreme 4.

FIXED!
Edited by Garming - 10/12/12 at 2:13pm
post #16640 of 38701
Quote:
Originally Posted by Garming View Post

Today I installed my 7950 TF3 and I seem to have ran into some issues. As I connected everything, it would not...i suppose post? After a few seconds, it switched to my onboard graphics and booted properly. I checked my device manager and it seems to detect the card and I installed the AMD drivers with no issue. But it seems that I can't actually use the card. Any ideas? I am using a Seasonic x-660 and my other components include an 3570k at stock speeds, 8gb ram, wifi card, ssd and asrock z77 extreme 4.

i cant see anything you did wrong.. if you used CCC 12.8 might cause problems but i think you might be unlucky and got a defective card so you might have to run back to the store and exchange it thinking.gif
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