acdc ninja Posted April 26, 2010 Posted April 26, 2010 hi, my gf is having issues with her computer, ive found the issue, seems the psu (860 watt psu, with 36 amps on the 12v+ rails) is insufficient for her gtx 275, and is causing graphically intense programs and games to crash, im wondering if 'underclocking' will help at all, the amp rating is right on the absolute minimum, so i was thinking that slightly underclocking would help stability, by drawing less power from the gpu, how should i go about this? and could this cause problems ( i know im taking stress off the gpu not putting more on but would there be any issues asociated with changing frequencies? thanks in advance Share this post Link to post Share on other sites More sharing options...
dihartnell Posted April 26, 2010 Posted April 26, 2010 hi, my gf is having issues with her computer, ive found the issue, seems the psu (860 watt psu, with 36 amps on the 12v+ rails) is insufficient for her gtx 275, and is causing graphically intense programs and games to crash, im wondering if 'underclocking' will help at all, the amp rating is right on the absolute minimum, so i was thinking that slightly underclocking would help stability, by drawing less power from the gpu, how should i go about this? and could this cause problems ( i know im taking stress off the gpu not putting more on but would there be any issues asociated with changing frequencies? thanks in advance Unlikely thats the problem. A GTX275 only takes around 220 watts. A 860 Watt PSU could power two easily even overclocked. It could be instability in PSU or driver, or is it overclocked? What make and model PSU? Share this post Link to post Share on other sites More sharing options...
joel.monteiro Posted April 26, 2010 Posted April 26, 2010 Check ur CPU temps, and update all ur drivers. Share this post Link to post Share on other sites More sharing options...
hierovision Posted April 26, 2010 Posted April 26, 2010 I can't find the official source, but I've heard around the other PC forums that the GTX 275 requires at least 40 amps on the 12v rail(s). Others with 36 amp power supplies have reported shutoffs during use. I'm guessing underclocking may not help all that much, and in fact may lead to a false sense of stability. It might work but the health of your card may also go down in turn. There are definitely some good, cheap power supplies out there that can handle 40 amps on the 12v rail. http://www.newegg.com/Product/Product.aspx...5&Tpk=650tx 52 amps on a single rail for $90 and free shipping. Good combo deals on that item too. Share this post Link to post Share on other sites More sharing options...
ccokeman Posted April 26, 2010 Posted April 26, 2010 I dont think the PSU is it. Have you tried blowing the dust out of the heatsink? Upped the fan speed What make and model is her PSU how many 12v rails does it have Share this post Link to post Share on other sites More sharing options...
hierovision Posted April 26, 2010 Posted April 26, 2010 I dont think the PSU is it. The only 860 watt PSU I could find with 36 amps is the Shaw 860W unit with two 12 volt rails (19 amp and 17 amp). Google that bad boy and see if you change your mind lol. Share this post Link to post Share on other sites More sharing options...
CowKing Posted April 26, 2010 Posted April 26, 2010 The only 860 watt PSU I could find with 36 amps is the Shaw 860W unit with two 12 volt rails (19 amp and 17 amp). Google that bad boy and see if you change your mind lol. my 550w has better rails than that. does she have like 400w just for the CPU? Share this post Link to post Share on other sites More sharing options...
hierovision Posted April 26, 2010 Posted April 26, 2010 They're severely inflated wattage numbers. I believe it has 50 amps on the +5v rail and 47 amps on the +3.3v rail. This severely boosts the overall wattage number. When will you need 400+ watts for your motherboard components? 155W for +3.3v and 250W for +5v is pretty ridiculous. The Seasonic X-750, by comparison, uses a combined 125W rating for their +3.3v and +5v rails (25amp max output). Share this post Link to post Share on other sites More sharing options...
acdc ninja Posted April 27, 2010 Posted April 27, 2010 its a shaw psu, so yeh 17 and 19 on the 12v rails, ive read the same, that it needs around 38 - 40 amps, so i was almost certain that it would be the psu, it wouldnt be dust, its a new computer, got it for her not long ago for her uni studies , anyway thanks everyone for the help, looks like il have to buy her a new psu, it isnt any real problem now, but when she gets back into 3d graphics with maya, it could be an issue, also she wants to play bioshock 2 thanks Share this post Link to post Share on other sites More sharing options...
Drdeath Posted April 27, 2010 Posted April 27, 2010 GTX275 should run on 24 amps or so. It may need a little more when it powers up or runs at max capacity. Share this post Link to post Share on other sites More sharing options...
hierovision Posted April 27, 2010 Posted April 27, 2010 Where did you get that information Drdeath? I'm genuinely curious, I can't find the official numbers anywhere. The only thing I've seen were forums posts and they all consistently said it needs 40 amps. Share this post Link to post Share on other sites More sharing options...
RadMos Posted April 28, 2010 Posted April 28, 2010 (edited) Nvidia says MINIMUM POWER SUPPLY REQUIREMENTS Minimum 550W or greater system power supply, with a 12V current rating of 40A. I think the problem is the PS. You need a better one. A bit of useful information. Nvidia Geforce GTX 4*0 in SLi - 55-60A and a 850W PSU minimum GeForce GTX 480 - 40A and a 600W PSU minimum GeForce GTX 470 - 35A and a 550W PSU minimum GeForce GTX 295 in Quad SLi - 70A and a 1000W PSU minimum GeForce GTX 295 - 50A and a 700W PSU minimum GeForce GTX 285 - 46A and a 550W PSU minimum GeForce GTX 280 in SLi - 55A and a 800W PSU minimum GeForce GTX 280 - 40A and a 550W PSU minimum GeForce GTX 275 in SLi - 50A and a 800W PSU minimum GeForce GTX 275 - 40A and a 550-600W PSU minimum GeForce GTX 260 OC in SLi - 50A and a 700W PSU minimum GeForce GTX 260 OC - 40A and a 550W PSU minimum GeForce GTX 260 in SLi - 50A and a 700W PSU minimum GeForce GTX 260 - 38A and a 500W PSU minimum GeForce GTS 250 - 32A and a 500W PSU minimum GeForce GT 240 - 35A and a 400W PSU minimum GeForce GT 220 - 30A and a 350W PSU minimum GeForce 9800 GX2 - 35A and a 550W PSU minimum GeForce 9800 GTX+ - 32A and a 500W PSU minimum GeForce 9800 GTX - 25-30A and a 450W PSU minimum GeForce 9600 GT - 26A and a 450W PSU minimum GeForce 9600 GSO - 26A and a 450W PSU minimum GeForce 8800 Ultra - 35A and a 500W PSU minimum GeForce 8800 GTX – 30A and a 450W PSU minimum GeForce 8800 GTS 512MB - 28A and a 500W PSU minimum GeForce 8800 GTS 320/640MB – 26A and a 400W PSU minimum GeForce 8800 GT in SLi - 36A and a 500W PSU minimum GeForce 8800 GT - 26A and a 450W PSU minimum GeForce 8600 GT/GTS - 24A and a 350W PSU minimum GeForce 8500 GT - 22A and a 350W PSU minimum GeForce 7950 GX2 – 27A and a 400W PSU minimum GeForce 7950 GT – 22A and a 350W PSU minimum GeForce 7900 GTX – 22-26A and a 350-400W PSU minimum GeForce 7900 GTO – 22-26A and a 350-400W PSU minimum GeForce 7900 GT – 22-26A and a 350-400W PSU minimum GeForce 7900 GS – 22-23A and a 350W PSU minimum GeForce 7800 All - 26A and a 400W PSU minimum GeForce 7800 GS AGP - 20A and a 400W PSU minimum GeForce 7600 GT – 22-26A and a 350W PSU minimum GeForce 7600 GS – 15-17A and a 350W PSU minimum GeForce 7300 GT – 15A and a 300W PSU minimum GeForce 7300 GS – 15A and a 300W PSU minimum ATI Radeon HD 5970 CrossfireX - 70A and a 900W PSU minimum Radeon HD 5970 - 50A and a 600W PSU minimum Radeon HD 5870 CrossfireX - 55-60A and a 700W PSU minimum Radeon HD 5870 - 40A and a 500W PSU minimum Radeon HD 5850 CrossfireX - 55-60A and a 650W PSU minimum Radeon HD 5850 - 35-40A and a 500W PSU minimum Radeon HD 5830 - 35-40A and a 500W PSU minimum Radeon HD 5770 - 34A and a 500W PSU minimum Radeon HD 5750 - 30A and a 450W PSU minimum Radeon HD 5670 - 26A and a 400W PSU minimum Radeon HD 5570 - 24A and a 350W PSU minimum Radeon HD 5450 - 22A and a 300W PSU minimum Radeon 4890 - 32A and a 550W PSU minimum Radeon 4870 X2 CrossfireX - 1000W PSU minimum Radeon 4870 X2 - 600W PSU minimum Radeon 4870 - 32A and a 500W PSU minimum Radeon 4850 - 30A and a 450W PSU minimum Radeon 4830 - 26A and a 400W PSU minimum Radeon 4770 Crossfire - 34A and a 750W PSU minimum Radeon 4770 - 26A and a 400-500W PSU minimum Radeon 4670 - 26A and a 400W PSU minimum Radeon 4650 - 24A and a 350-400W PSU minimum Radeon 4550 - 20A and a 300W PSU minimum Radeon X3870 X2 - 30A and a 550W PSU minimum Radeon X38xx series - 28A and a 450W PSU minimum Radeon X2900 XT Crossfire - 45A and a 800W PSU is recommended for high-end rigs Radeon X2900 XT - 35A and a 500W PSU is recommended for high-end rigs Radeon X2900 Pro - 35A and a 500W PSU minimum Radeon X2600 XT - 25A and a 400W PSU minimum Radeon X2400 XT - 20A and a 350-400W PSU minimum Radeon X1950 XTX – 20A and a 420W PSU minimum Radeon X1950 Pro – 20A and a 420W PSU minimum Radeon X1900 XTX – 25A and a 520W PSU minimum Radeon X1900 XT – 22-25A and a 520W PSU minimum Radeon X1900 GT – 22A and a 400W PSU minimum Radeon X1650 Pro – 18A and a 350W PSU minimum Power supply recommendations: 700W - 1000W OCZ Z Series 1000W - 83A on a single +12V rail Corsair TX 950W - 78A on a single +12V rail PC Power & Cooling Silencer 910W - 74A on a single +12V rail Corsair TX 850W - 70A on a single +12V rail OCZ Z Series 850W - 71A on a single +12V rail XFX 850W Black Edition - 62A on a single +12V rail Corsair TX 750W - 60A on a single +12V rail PC Power & Cooling Silencer 750W Quad - 60A on a single +12V rail 300W - 650W Corsair TX 650W - 52A on a single +12V rail Seasonic X-Series 650W - 54A on a single +12V rail XFX 650W XXX Edition - 52A on a single +12V rail Rosewill Green Series 630W - 50A on a single +12V rail Corsair VX 550W - 41A on a single +12V rail Ultra X4 500W - 32A on a single +12V rail Corsair VX 450W - 33A on a single +12V rail PC Power & Cooling Silencer 420W ATX - 30A on a single +12V rail Corsair CX 400W - 30A on a single +12V rail PC Power & Cooling Silencer 370W ATX - 27A on a single +12V rail MSI Forum Edited April 28, 2010 by RadMos Share this post Link to post Share on other sites More sharing options...
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