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OP is wanting to do this on a budget. The G3258 when significantly overclocked will equal or exceed the many of the AMD APU quad cores. A lot of games do not use more than two cores very well anyway and so the greater per core performance of the G3258 is an advantage, at least when overclocked to the mid 4.x ghz range.
Check this out: http://www.tomshardware.com/reviews/pentium-g3258-b81-cheap-overclocking,3888.html
If you went per core performance at the same clocks the newer APUs have a better IPC than the FX. Here's what I mean
AMD
bassnut / A10-7850K @ 4707.67MHZ / H20 / 14 min 3.092sec
Johan45/ AMD 1090T @ 4.9/H20/ 14m 09.328
Johan45/ AMD 1090T @ 4853 / H20 / 14m 14.578s
bassnut / A10-7850K / H20 / 14 min 19.764 sec
Dr. McCoy/FX 8320/H2O/14m 23.735sec
Johan45/ AMD 1090T @ 4812 / H20/ 14m 26.719s
Johan45/ AMD 1090T @ 4741/ H20/ 14m 38.375s
bassnut / A10 7850K / H20 / 14m 38.732
PolRoger / FX-8370 / Water / 14m 40.075s
Scotty / FX-9590 / Water / 14m 40.406s
Scotty / FX-9590 / Water / 14m 44.359
This was taken from the december SPi32 challenge that had a 5.0 cap. If you notice the FX was still beaten even with a 300MHz advantage plus bones has some skill when it comes to Spi.Also of note is it beat the 1090T I was running with a 200 MHz advantage. AMD really has made some improvements with their chips. Still not the intel killer but finally has passed the PII.
If you went per core performance at the same clocks the newer APUs have a better IPC than the FX. Here's what I mean
AMD
bassnut / A10-7850K @ 4707.67MHZ / H20 / 14 min 3.092sec
Johan45/ AMD 1090T @ 4.9/H20/ 14m 09.328
Johan45/ AMD 1090T @ 4853 / H20 / 14m 14.578s
bassnut / A10-7850K / H20 / 14 min 19.764 sec
Dr. McCoy/FX 8320/H2O/14m 23.735sec
Johan45/ AMD 1090T @ 4812 / H20/ 14m 26.719s
Johan45/ AMD 1090T @ 4741/ H20/ 14m 38.375s
bassnut / A10 7850K / H20 / 14m 38.732
PolRoger / FX-8370 / Water / 14m 40.075s
Scotty / FX-9590 / Water / 14m 40.406s
Scotty / FX-9590 / Water / 14m 44.359
This was taken from the december SPi32 challenge that had a 5.0 cap. If you notice the FX was still beaten even with a 300MHz advantage plus bones has some skill when it comes to Spi.Also of note is it beat the 1090T I was running with a 200 MHz advantage. AMD really has made some improvements with their chips. Still not the intel killer but finally has passed the PII.
Intel i3 http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=8526347&CatId=11860 vs FX-8310 http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=9494388&CatId=11857
I believe the FX-8310 runs in mATX boards. Not too bad on the VRM at stock, leave green on.... 760G handle it just fine. I'd look for an Asus 760G chipset board, but that's me.
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=8398367&CatId=7244
Not sure about core vs core here. I've never run an i3 dual core before. But if performance was close enough, I'd imagine 8 cores vs 2 cores would be a lot of fun.
"It can't overclock" Which is true to an extent. Find and know the limits, find and know your cooling capabilities and OC based on that.
If you need examples and help overclocking on 760G AMD chipsets, I'd gladly help.
Sorry if this is BUtt In material. Somewhat of my opinion.... FX-8310 > i3-4xxx
Makes me wonder if I should have gone FM2+ and the best APU I could buy and overclock it like mad...