My cpu is an Athlon 64 5600+ Windsoar 2.8ghz x2 128kb l1 cache x2 1mb l2 cache x2 my motherboard is a Gigabyte M57SLI-S4 nForce 570 sli pcie x16 1.0 socket am2 my ram is 3 gigs of wintec ampx ddr2 800 pc26400 but i realized i need 1 more stick to do dual channel psu i am going to upgrade it for sure it was just a budget thing hec HP585D +3.3V@36A,+5V@36A,+12V1@19A, +12V2@20A,-12V@1A,+5VSB@2.0A I probably wont be able to upgrade for while but i have been wondering if my system would bottleneck a radeon 4850 or not. One other thing i want to check is that it said its pcie x16 2.0 but i thought i heard that nothing could overload a pcie x16 1.0 bus anyway is that true or did i hear this before these cards came out? If it will than i will just wait and see whats out later on. If you know please tell me if an accelero s1 rev 2 will fit on it but you don't have to look it up or anything. Sorry if i misspelled bottleneck (or anything else) its how spell check tells me to and I'm also sorry if there is some guide that says what CPU's bottleneck which cards. thanks for taking the time to help!