Totally perplesed

I think it's cheaper and easier to make one big single rail than multiple smaller ones.... and much easier for cable management.
 
I won't even think about telling you or suggesting you buy another PSU.

Assuming your present PSU is not faulty you don't need a new PSU. I have no way of knowing if it is or isn't. Testing requires being able to load it to see if it is working properly.
 
doyll said:
I won't even think about telling you or suggesting you buy another PSU.

Assuming your present PSU is not faulty you don't need a new PSU. I have no way of knowing if it is or isn't. Testing requires being able to load it to see if it is working properly.
Click to expand...

I don't claim that it's faulty, what I'm saying is that it doesn't output enough on the 12v rail!
 
Robfromwilts said:
Read the thread, but there seem to be molex and pumps involved. I don;t have water-cooling and am not using any molex, so not sure if it's any help
Click to expand...

Ignore the part about the pump, just focus on adding parts outside of the case until it refuses to post.

In my situation I have returned the psu motherboard and cpu and still awaiting outcome. I did have the psu tested and according to the place that tested it I had a faulty 5v which shares a rail with the main 12v. I suspect the psu fault in ny case has wiped out either the motherboard or cpu.
 
pgi947 said:
Ignore the part about the pump, just focus on adding parts outside of the case until it refuses to post.

In my situation I have returned the psu motherboard and cpu and still awaiting outcome. I did have the psu tested and according to the place that tested it I had a faulty 5v which shares a rail with the main 12v. I suspect the psu fault in ny case has wiped out either the motherboard or cpu.
Click to expand...

Mobo, cpu, memory & GPU have all been returned to seller & sent back to me as "Fully functioning". I think my PSU may be the problem. Not 'cos it's faulty, but because it doesn't put out enough power on 12v rails.

Still hoping for someone to offer an opinion on this please!!
 
Answer needed to Question!

If I knew the answer to that question, I doubt I'd be having these problems! However, I'm useless at the electrical side of computing (I may have got a CSE grade 4 in physics!!).

I get horribly confused by electric currents and the maths behind it. I see your point regarding the numbers, but I have no answer. All I know is that the mobo, cpu, memory and GPU have all been checked and are OK. The 4850 works fine in my current rig, the 6850 refuses to do so.

I really can't afford to keep paying people to look at my PC and say they can't see what the problem is. As I see it, the problem lies with the Power supply. As I pointed out before, I think that the dual rail of the PSU I currently have is not outputting sufficient Amps. How, or why I don't know for certain, and I don't have the technical knowhow to resolve it.

So, Should I buy the Cooler Master Silent Pro Modular 2 620w '80 Plus Bronze' Modular Power Supply [RS620-SPM2E3-Uk] or not? It's a really simple question.

Does anybody else have any ideas on this please?
 
I wouldn't touch a cm psu, xfx or corsair.

Wattage doesn't mean squat if the 12v has a weak amperage rating.
 
doyll said:
Smaller number of watts is less power.
If PSU is big/powerful enough to run a 210 watt GPU is will run a 139 watt GPU.

You degree in physics should have required enough basic math to understand that. ;)
Click to expand...

pgi947 said:
Wattage doesn't mean squat if the 12v has a weak amperage rating.
Click to expand...

Second quote is only thing I understand so far, and I think it supports my theory?
 
Np

And stated wattage is often over stated dragging the amperage down with it. A cheap 1000w psu will not pull ~80a due to the shoddy efficiency.

Of course certain electrical laws apply but you have to factor in efficiency.
 
pgi947 said:
Np

And stated wattage is often over stated dragging the amperage down with it. A cheap 1000w psu will not pull ~80a due to the shoddy efficiency.

Of course certain electrical laws apply but you have to factor in efficiency.
Click to expand...

That also makes sense. I can't pm you, cos I don't have enough posts :rolleyes:

I'm fairly certain that the problem is with the 12v rail. Do you agree??

Could you recommend a few PSU's around the £100 mark that would be capable of running the spec I've shown earlier in thread? (particularly the ASUS RADEON 6850).

Thanks again,

Rob
 
Rob, if our PSU is not defective it is plenty big enough to run you GPU. If you want a new PSU go for it, but please quit trying to rationalize it by saying yours isn't powerful enough.
 
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