Which graphics card is better for gaming?

Thanks man. I know the 6850 needs a bit less power than the GTX 460. In fact it doesn't need 2 6pin connectors like the GTX 460, it only needs 1 6pin connector

150$ is my budget. But here in my country the GTX 460 1gb with 256 bit bandwith is 135$ and the HD 6850 is 160$
Though i wouldn't mind spending 10$ more if the performance is worth it.
One more thing i should add is that my PSU only has 2 molex connectors and the GTX 460 requires 4 (i mean those 6 pin adapters. 1 requires 2 molex connectors).
On the other hand the HD 6850 requires only one 6pin power connector so i need 2 molex connectors (which i have).
So a good quality PSU with at least 4 molex connectors is 45$ here. If i buy the GTX 460 i'm gonna need a new PSU aswell, so the cheaper path is going with the HD 6850 by 20$. But since i never used AMD/ATI graphics cards, i'm not so sure about it. I've heard most people say that ATI's drivers suck so the HD 6850 could perform a bit slower than the GTX 460 even if its specs are better, an easy way to tip the scales towards the GTX 460 since Nvidia has great drivers

Xilence XP500.
That's a 500W PSU.
Its other "specs" are:
AC Input |110-240V | 8.5A - 5.5A | 60-50Hz
DC Output |+3.3V | +5V | +12V1 | +12V2 | -12V | +5VSB
| 26.0A | 30.0A | 18.0A | 20.0A| 0,5A | 2.5A

Cable system:
x1 20+4 pin MB
x1 +12V 4pin
x2 S-ATA
x2 S-ATA
x2 Molex 4 pin
x1 4 pin FDD

Sorry about the long text but i wanted to be precise about its specs

Well it's an adequate power rating that's for sure. It has the power to run either card but like you said, trying to get two 6-pins out of the two 4-pin molex doesn't sound easy or even like a good idea. I dunno, maybe someone's tried it - EDIT: ^^^^^haha see above.

If the PSU wasn't an issue, for the prices you listed, I'd get the 460 (they are very similar performance). But with that PSU I would get the 6850. Some games run better on nvidia, and some on amd.

Yup, I think you'll be needing a new PSU. What website are you looking at? I may be able to help you select parts that offer good performance but don't cost an outlandish amount of money.

Keep in mind it's after rebate.