Associate
I am frequently reminded how important it is to have a power supply that can deliver a lot of stable clean 12V.
I'm also aware that it isn't as simple as adding the current available on the 12V rails.
For example my PSU has three 12V rails rated at 18A, 18A and 16A (52A in theory). But there is a caveat that you can only draw a total of 34A at 12V.
My question is if your PSU has dual 12V rails and has a bundle of wires rather than being modular how can you tell whether you are connecting to 12V1 or 12V2?
Specifically I'm having trouble with a HD4890 on my son's computer. It keeps crashing even at settings at which the previous 1800XT could manage - I suspect a power problem.
It is a TRUST PSU with rails as follows
3.3 - 32A
5V - 30A
12V1 - 12A
12V2 - 16A
Spec limits 3.3 and 5 combined to 170W but no limit on 12V (so assume we can get 28A).
My concern is that it only has one PCIe, so I bought a hard disk power (old style big) to PCIe adaptor.
It's quite likely that the PSU just isn't upto it but one thought was
how do I know if I am using both 12V rails or just trying to take everything off one rail?
Any ideas before I buy a new PSU.
Cheers,
Nigel
I'm also aware that it isn't as simple as adding the current available on the 12V rails.
For example my PSU has three 12V rails rated at 18A, 18A and 16A (52A in theory). But there is a caveat that you can only draw a total of 34A at 12V.
My question is if your PSU has dual 12V rails and has a bundle of wires rather than being modular how can you tell whether you are connecting to 12V1 or 12V2?
Specifically I'm having trouble with a HD4890 on my son's computer. It keeps crashing even at settings at which the previous 1800XT could manage - I suspect a power problem.
It is a TRUST PSU with rails as follows
3.3 - 32A
5V - 30A
12V1 - 12A
12V2 - 16A
Spec limits 3.3 and 5 combined to 170W but no limit on 12V (so assume we can get 28A).
My concern is that it only has one PCIe, so I bought a hard disk power (old style big) to PCIe adaptor.
It's quite likely that the PSU just isn't upto it but one thought was
how do I know if I am using both 12V rails or just trying to take everything off one rail?
Any ideas before I buy a new PSU.
Cheers,
Nigel