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My Tagan 700W Not Powerful Enough for a GTX480 ?!

post #1 of 5
Thread Starter 
I posted on another thread problems with a Gigabyte 480 SOC I have - which is stock at 820 @ 1.035V

basically - I ran Heaven and artefacts (flashing textures, starbursts etc) - were immediately visible, ran some games - had odd missing texture etc - ran OCCT and was up to ks of errors within 20 seconds. Odd when running Heaven sometimes it looks - in the transitions that they're not smooth - ie some flicker almost as if the cards not getting enough voltage period

I tried checking the status of 12V rail under load and it doesn't drop below 11.8 or so - but thats not to say the PSU is limiting the current or somethin. So I tried bumping voltage on the 480 with supplied software and that made it more stable, but still not totally stable

went back to stock volts and dropped clock to 760 and passed OCCT, games all stable etc

I decided to send back to Gigabyte as an RMA, they have performed - what seems from their email (including lots of photos of card in test rig and screenshots from them) - very thorough tests, including Heaven, 3 hrs 50 of Furmark (!!) and found no artefacts or problems ... they were running card at 1600 res (their monitor max res) - but I can't see that being a problem - they were applying 8xAA etc

I've run a GTX570 and my 4890 on my P5B Deluxe mobo with no issues- I'm guessing its not my mobo... which only leaves my PSU ?

PSU is a Tagan Dual-Engine 700W - its about 4 yrs old, was era of where split rails (although how split in reality I'm not sure) was the rage on decent power supplies, so it has 4x20A rails for the 12V

worrying one person had some tech feedback that both PCI-E power cables are on one rail - so I tried using Molex to 6 pin for one of the power inputs to the 480, the other powered from the PCI-E power - was no better

obviously I have to use a 6 to 8 pin converter as well which is not ideal

I think in one review I read where they pushed it to its max 700W - they only managed 13A from each 12V rail

in summary -b efore I spend £120 on a Corsair AX850, HX850 or XFX Black Edition - do people agree it could be my PSU ? I can't think of anything else it could be ?

thankyou very much for any help as I'm pretty stuck at the moment without taking a gamble and spending more money

cheers

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post #2 of 5
It could be the psu but i think its a faulty connection on the cables somewhere
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post #3 of 5
That's not a problem caused by the PSU, generally. That 99% of the time caused by faulty graphics card VRAM or core.
post #4 of 5
Thread Starter 
thanks for replies - I hear what you are saying - but I have no reason to doubt Gigabyte I mean they reckoned they ran Furmark for 3 hrs 50 without any artefacts - and ran Heaven without any artefacts either. when I ran them I had artefacts all over the place - until I dropped core speed down

I've used Gigabyte RMA process before with no issues so have no reason to doubt them

and as I've used a 570 in my PC with no issues, and my 4890 is fine- I can't imagine anything other than the PSU ?

re cabling I'm having to use a 6 pin to 8 pin converter cable, but I've 2 different ones - I tried both and had same artefacts

note my PC config wise I tried just about everything I could from

(1) Complete reinstall of Windows
(2) Reinstall of Nvidia drivers, tried different versions too
(3) Dropping PC to stock clock speeds (OC'd Q6600)

etc etc

Motherboard is a P5B Deluxe

so only really leaves PSU
post #5 of 5
Thread Starter 
I thought I'd update it:

so bought a Corsair HX850 - which is plenty powerful enough and very high quality.....

same artefacts - no better and no worse

really annoyed now - as wasted another £110

any ideas ?

lots seem to be having issues so something very wrong somewhere
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