Price is high and puts out a lot of heat but works well for its age.
6 September 2012
Summary: Bottom line: Pricey for what it is but works well for its age. Word of warning, this is a HOT running CPU. At 125 watts be ready with a water or large air cooling system. Overall its a good CPU for its age. Scores a 6.3 in WEI, and plays BF3 on med settings AA @ 4x @ 40FPS. (I have it mated to a 9800GT.) Its an old system but solid. The price is a little high for what it is but if all you want to do is upgrade your CPU than this is the best route to take.
Summary: By the time I bought this chip 4 years ago it was already being replaced as the king on the block by quad and hex core chips. I got this for my msi k9a2 platinum and it runs pretty fast from what I can tell. Summary of what I've done with the chip: -Play Deus Ex, Sacred Gold, Portals, Half-Life, Bioshock, and Minecraft w/o any noticeable lag. -Moved 750GB worth of video and pics over to a 2TB external HDD in just under 8hrs.
Summary: I built myself a video editing PC and originally used a Athlon 64 X2 5000+. I found myself wishing it was faster as I watched it render video. I found this processor online and replaced my 5000+ with this 6400+. It boosted through-put on the rendering process and made life bearable again.
Summary: Causes stability issues, freezing about 5 times in a 2 day period and then works great for a month. cant figure that out, but other than that this thing rocks! improved frame rates by a consistant 300%. Everest says i run a cool 30-35C at all times. High airflow case helps that... I do not overclock.
Summary: I wanted to upgrade a single core 1.8ghz and keep the same motherboard. The chip is great, very fast. It runs a little hot so better-than-stock cooler is a good idea. Made a world of difference in my rig's performance. The best thing about getting the cpu was being lucky enough to meet Tangaishi (seller) on this site. He made the entire thing painless, professional and worry-free. Check him (and the processor) out.