Antec neopowerHE 500W, enough for HD4890?

[fffblackmage]

Like the title says, is the Antec neopowerHE 500W psu enough for a HD4890? I'm guessing it should be just about enough.

But I'm also wondering how would you connect the two pci-e power connectors onto the psu. The psu is modular and a pic near the bottom of this article will better illustrate what I'm trying to ask. Would you hook up one pci-e connector to each "set" or just use one set for both pci-e power connectors?

 

[HOOfan 1]

what else are you powering???

I am looking at the wire, and I can't tell if it is 18AWG or 16AWG, it looks like it says 16. It is stranded wire though, and has 90C insulation, so if it is 16AWG it should be able to handle ~10A to 13A per a wire. A couple of 6 pin PCI-E connectors can pull ~6A a piece. If those are 16AWG wires going to 12V2 then that is at least 20A capability per a set, since there are two per a set. I'd say, if you don't have any other connectors plugged into the modular interface, it won't matter one bit. If you have a bunch of hard drives etc. plugged into the modular interface, then sure .

edit: nope that must be 18AWG wire but I still think a couple of 18AWG wires could handle two 6 pin PCI-E connectors alone. I think my numbers for current capacity for 16 AWG was a little low.

 

[fffblackmage]

I guess it's my fault for not being descriptive enough.
My computer consists of:
E6320 @ 2.8GHz/1600MHz FSB
nForce 650i Ultra
2x1GB Crucial DDR2-800
DVD+/-RW drive
2x 7200RPM HDD
1x 200mm fan
4x 120mm fans

and of course, currently, an x1950xt OCed at 675MHz core / 972MHz vram

My PSU supplies 17A on all 12V rails.

edit: Ah, I forgot Antec had that wattage calculator thing. Seems like I only need 366W of continuous power.

 

[Lunyone]

My first guess would say that you should be able to power the 4890 up with 36A on the 12v rails combined (17A on all 3 12v rails). The only thing that I'd be concerned with is how old your PSU is, because you can generally count on about 10% loss in power per year, due to capacitor aging. Now that is a general assumption, so you might not have that much or you might have a bit more loss. With the parts you've listed, you should be okay. I'd consider getting a newer PSU in the future though, so you won't have to worry about any PSU related issues.
Here's a picture of the PSU sticker, for those that might need a reference to one.Antec Neo HE 500w PSU Specification Sticker