Hi, i have a GTX 275 and a 500watt PSU that came with a tower i bought last year. I have not used it yet, i have a Hyper PSU for my main PC, but i want to build a second one to use the GTX 275 on it. The PSU is really no-name, no label, just marked 500Watt and has some stats on the side. Is there any way to make sure that this is going to be OK for the PC? I wouldn't like to fry a motherboard or the card.
By the way, this PC will only have a Core 2 Duo E6600 2,4Ghz CPU, 2 Sticks Ram, and 1 hard drive except the card. So i think it must be sufficient, but is there a way to be sure? Can i find out by looking at the table it has on the sticker on the side? Can i do any damage if i try it and its not enough after all? Because otherwise i should just buy a new one and get rid of this.
I tried a similar PSU calculator, and the result is that i would be fine with 380 watt PSU. But i also read somewhere that for the GTX 275, you should make sure that 12V1 give 20A, and 12V2 gives also 20A. But on the sticker on the PSU i see only 1 value for 12V, giving 20A. Maybe this is a problem? And even if i try it anyways, i cant harm the other components if something goes wrong and PSU cant take the load?
First, A high quality 500 to 550 watt psu will have a +12 volt rail rated at 40 amps. The current (amps) on the +12 volt rail of your generic power supply is low. At only 20 amps the maximum wattage for the +12 volt rail is 20 amps x 12 volts = 240 watts maximum. Your going to come up short while playing games.
Second, the power supply should be at least 80+ Bronze certified for energy efficiency. There are some models available which have achieved 80+ Silver and 80+ Gold Certification. In all probability your power supply is not energy efficient. It will run hotter and deteriorate quicker.
Third, the official Nvidia recommendation is for a system with one GTX 275 video card is a 550 watt or greater power supply with two, 75 watt, 6 pin, PCI-e power connectors.
My best advice is you should consider getting a new power supply capable of delivering the necessary power to your system.\
Corsair and Seasonic are two of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units. One example would be the Antec Earthwatts series which is a major improvement over Antec’s older psu’s like the Basiq models.