Whats the highest gfx card a e8400 will bottleneck

I think your 4890 will see a bit of a bottleneck unless clocked at say 3.5-3.6GHz.

Most new GPUs in a single setup can use a Phenom II or C2Q 65/45nm without presenting a bottleneck but dual or higher needs a Core i5/core i7 or higher clocked Phenom II.

i don't see how a e8400 at 3ghz bottlenecks a 4890 o.O

It depends at what res you game.In current games once you start getting to 1920*1050 your graphics card starts to be the major bottleneck. If you overclocked you cpu a bit more it should be able to handle even a 5850 or 5870 at 1920*1050 or greater. Although it should still be sweet at lower res too. Lots of tests actually show the e8400 keeps up with i7 extremely well in gaming.

So overclock that cpu so she flies and see if you can get your hands on a 5850!!

Also depends on the game you're playing, since not all games make use of more than 2 cores.

Note: It's 1920 x 1080, 1050 is for 1680 x 1050.

Here's an interesting read for you. The e8400 is running at stock speed in these tests.

http://www.tomshardware.co.uk/build-balanced-platform,r...

Actually, it's usually 1920x1200.
1920x1080 is a new-fangled 16:9 display as opposed to the more traditional 16:10 PC widescreen.

i game at 1920x1080