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Gigabyte GTX480 SOC - Artefacting (help please)

post #1 of 21
Thread Starter 
new card - won't run at the "stock" 820 speed

basically was getting flashing "blue" textures, "quick" black flashes (both horizontal and vertical) on screen, and odd "stars" occasionally appearing - when running Heaven. Also in transitions almost seemed as if card was pulsing rather than smooth transition

OCCT just got into the hundreds of errors within 20 seconds or so ...

Afterburner reckons stock volts is 1.038V, Gigabyte OC software reckons 1.025V

if I drop clock speed to 760 - all is OK - passes 20 mins of OCCT without error

I'm about to RMA, but want to check if theres anywayit could be my system

(1) I have a Tagan 700W - its a high quality one I would expect it to be enough - but any chance its not providing enough current to the card ? I don't think card is pulling that much power - my wall meter reckons for whole base unit under OCCT about 460-470W

(2) I have a PCI-E 1.1 mobo ... didn't the amount of power drawn frmo the slot increase whn they went to PCI-E 2.0 - is it possible the 480 is expecting to be usedin a PCI-E 2.0 and its somehow leaving a power deficit ?

(3) could it be something weird like me PCI-E bus speed ? (I've tried dropping to 95MHz, and increasing to 105 MHz) to no avail

I've tried dropping my CPU clock from 3.5 gig down to 2.8 gig to lower power consumption by 50-80W or so - but makes absolutely no difference to artefacting

stuck for ideas other than the card isn't stable at stock overclock

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post #2 of 21
1.) Wattage looks ok.
2.) PCI-E 1.1 will cover the slot demands of 2.0. No worries there.
3.) PCI Bus speed should be fine within a few point tolerance of 100. I'd leave it alone as it never has anything to do with stability unless your pushing your motherboard to extreme frequencies.

If you have aready done a clean install of your drivers and flashed your bios without success then I'd RMA it. Anyways good luck with it.
Edited by Interpolation - 3/22/11 at 12:13pm
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post #3 of 21
Thread Starter 
thanks Interpolation

just worried as a few of us bought these SOC cards and some hae had problems some not - it seem - asking questions on here as don't want to RMA if its something up with my config

one user apparently took his back today - had it tested on a higher specced PSU (in shops case 850W - users case 700W) - and apparently passed with no problems/artefacts ...

I just wouldn't expect a lack of power to end up with artefacts though ?

I just re-ran Heaven (artefacts all over place again) - CPU at stock, and power drawn from wall only 350W which is quite low

I seem to remember when my PSU was reviewed, when ran at 100% it drew about 850W from wall (which makes sense as 80% efficiency would mean PC getting about 700W)

that said it did state max draw from PCI-E 12V line was 13A though ??
post #4 of 21
My pleasure.

Very understandable considering your circumstances. I would likely do the same thing myself in your situation.

Yes a lack of power on the 12v rails can cause gpu artifacts or system hangs. A stock GTX480 is recommended to have 40-42A supplied combined via its 8/6 pin connections and your Tagan PSU offers 20A's each rail. This might explain the card browning out under heavy load especially considering its high 820MHz base clock.

Maybe a temporary substitute isnt an unwise idea to rule out any PSU concerns. Its personally what I'd do.
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post #5 of 21
Thread Starter 
thanks - a replacement PSU is not an easy check though I'd be looking at £110 for an 850W plus decent psu plus a whole host of recabling

how annoyed would I be then if it was the card after all lol

had a heavily overclocked 570 before and that was fine lol

not sure what to do now - I don't think I can really test the card in my 380W HTPC !!!!
post #6 of 21
Lol true. I can vouch for the Corsair TX750 being cheap and capable of handling the 480 upto 900MHz. Its often on sale for <$90USD. OCN's marketplace is also rife with goodies.

Other options might be to 1.) take the card to a local PC store and have them do you a small favour, or 2.) buy a PSU from a store with a reasonable return policy *cough*. OFC the latter lacks any moral integrity whatsoever lol.
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post #7 of 21
Thread Starter 
thanks

mmm just found a 1000W Silverstone for £95 - seems a bargain

http://www.scan.co.uk/todayonly/index.aspx

odd that the Olympia 1000W is cheaper on todays offers than the 750W or 850W

anything I should know about the Olympia 1000W that should put me off ?
post #8 of 21
Nothing really other than its a little noisy, and uses its own proprietary plug. It should fit the bill rather nicely.
---->HardOCP
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post #9 of 21
Thread Starter 
thanks for reply

for your interest these are the artefacts in Heaven- note few meg video download

artefacts-2.avi
post #10 of 21
Yah thats not good at all

Have you tired bumping your voltage up to see if it goes away? You could also try lowering your ram a bit... It's clearly defective but sometimes you can easily fix it without having to wait another month for a replacement card.
    
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