I asked this group last year about what components I should use in an old computer to support a graphics card I got. My plan was to modify an old computer to make it a graphics / game capable computer for my 12 year old son.
I already had the graphics card and this group suggested the CPU and Motherboard and it's all been working great. My son wanted to upgrade the CPU and purchased one and installed it and when he does that - nothing appears on the monitors - putting the old CPU back everything works OK. Here are the main components of the system:
We did upgrade the BIOS on the MB during the process of trying to get the new CPU to work.
I was thinking that a AM3+ may not be backward compatible for a AM3 board - and you just confirmed that wr6133. When I got the current MB is was to fix into an old Compaq desktop. The MB fit with our power supply, disk drives the graphics card, ect.
What MB would you recommend to go with the new FX CPU (if we can't get it returned)
The gigabyte board is better featured and a good board (I use it myself). The Asus is less featured but seems to be a popular budget choice.
Your going to want a CPU cooler as well if you overclock the CPU (that you likely will want to with an FX) but if your using a compaq case measure it to figure what can fit if you buy one. Something along the lines of a coolermaster 212+ or 212 evo (around $30) they are tall though so measure the case first.
Not sure what your budget is but if you stick with the CPU and get a new mobo I would get a cooler so I can OC and if your using the old compaq case I'd also grab a cheap mid-tower case even a really low end budget case ($30-ish) will likely have better cooling than compaqs one.
I should have said all of that in my original reply, but it was late and I wasn't thinking... I DID at least say that the board didn't support any FX CPU's, I just stupidly said to try to update the BIOS, when I KNEW that wouldn't work.