[Locutus of Borg]

@Blood

I think it is, keep in mind I had to guess since I can't actually see the sides of the unit.

@CP5670

I need at least 500 watts for the cards mentioned before

[CP5670]

You don't need any specific combined wattage. The official requirements are meant to cover all the low quality to units out there and can be ignored. What you want is something from a reputable brand that has enough power on the 12V lines.

The power usage of the 4890 itself is about 150W maximum. A typical system with it will use 300-350W on load. At least the Corsair unit I suggested will handle that easily.

[BloodEagle]

Uh, if that is in inches, it is about the right size for ATX.

Standard ATX (the case, not the PSU) is usually 3.5 x 6 x N.

Mine (the PSU, not the case) is 3.4"(H) x 5.9"(W) x 6"(D).

[Locutus of Borg]

I have a 350 watt power supply, but the ATI page says I need a 500 watt power supply

http://ati.amd.com/products/radeonhd4800/requirements-4890.html

[CP5670]

Standard ATX (the case, not the PSU) is usually 3.5 x 6 x N.

Mine (the PSU, not the case) is 3.4"(H) x 5.9"(W) x 6"(D).

You may actually be right. I thought he was measuring the size through the PSU cover on the case, in which case the actual size would be larger. However, the Micro ATX dimensions are closer to ATX than I thought, so it could really go either way.

I have a 350 watt power supply, but the ATI page says I need a 500 watt power supply

http://ati.amd.com/products/radeonhd4800/requirements-4890.html

Yes, this is what I was saying you should ignore if you're buying a new PSU.

[Locutus of Borg]

Why, I mean

I wouldn't want to risk it getting a 400 watt PSU. I'm already at 350...it seems reasonable to get a 500 anyway. Why tempt fate, right?

[Liberator]

Exactly, besides, you don't wanna be running the thing at max output, it'll be more efficient at about 75% load.

[CP5670]

Why, I mean

I wouldn't want to risk it getting a 400 watt PSU. I'm already at 350...it seems reasonable to get a 500 anyway. Why tempt fate, right?

If it's in your budget, sure. It will give you some room for future expansion. (assuming your case is in fact standard ATX)

But "500W' by itself doesn't mean anything. Your computer is not going to use more than 300W in reality, but there are plenty of low quality 500W units out there that will fail on it, and also some high quality units rated much lower that will work fine.

[Locutus of Borg]

I'd rather spend the extra $20-$40 for what they recommend, than have a failing unit or one that doesn't end up working.