• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

PSU for HD7970

T

tjbp

n00b
Joined
Mar 24, 2011
Messages
5
Hello,

I have and Radeon HD 7970 Ghz Edition. My PSU states that it has two 12V 19Amp rails, and I know that this means that the current limit is probably combined and capped at 38A.

The AMD website spec page says that it needs 150W and 75W from an 8-pin connector and 6-pin connector respectively. That means that the card needs at least 18.75A at 12V (I think). I expect that my PSU has sufficient power.

However, I am having problems that seem consistent with insufficient power. When I start Tomb Raider up I have significant artifacts and the computer will immediately reboot before the main menu is reached. The menu screens in Crysis 3 will load up correctly, however, once any 3D is loaded the computer will immediately restart without warning.

The graphics card is brand new, however, the PSU is 3 years old.

Does anyone have any suggestions?
 
We are going to need more information on your PSU before we can help.

In a nutshell, you should have a "high quality" PSU with at least 550w when using a 7970 GPU.
 
Hi,

The PSU itself is an 800W Atrix, Model: 800T. It was a fairly decent PSU when I bought it, the numbers appear to add up, yet lack of power seems the culprit.
 
I know that my 3 year old Antec True Power 650 powers my system just fine, I put my 7970 in Wednesday and played some battlefield 4 last night.
I have a lot of stuff in my machine, 2 SSD's, 7 spinning hard drives, corsair h60 cooler with 2 fans, and the 3 large fans that come in the HAF-932
Along with the i7 3770k and 16gb of ram.
 
My system is not that power hungry.
A single spinning hard drive, DVD Drive, 8gb Corsair RAM, Core i7-2600K.
I have 4 Chassis fans.

My PSU provides two 6-pin connectors for a PCI-e component. I have hooked one 6-pin connector up to the 7970. I have then had to use an adapter to change two Molex connectors to an 8-pin connection.
 
I sadly have to say that your PSU doesn't have the enough power to feed your card, a decent 800W will deliver in the 12V Rail at least 60A(720W).. and your PSU have 19A in 2 Rails thats not mean it have a combined of 38A(456W) it will be more or less 32-34A (384-408)..and thats hoping the PSU can deliver the labeled wattage of 2 19A on 12V Rail... a PSU with dual triple or quadra 12V Rails never scale totally, thats why the best PSUs have a single and stronger 12V Rail. my secondary/Work PC have a crappy cheap thermaltake TR2-700 700W PSU and it have 52A(624W) in the 12V Rail wich its fairly correct for a PSU of that wattage. yes your problem its due to lack of power PSU that cant deliver the labeled wattage wich its really bad to be a 800W PSU.
 
You must log in or register to reply here.
Back
Top