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DFI Lanparty UT 790FX-M2R & 7850

Last response: in Motherboards
February 23, 2011 4:01:05 PM


bought a phenom 2 X4 840 for this board but it doesnt work. Its not on the supported CPU list so I'm changing to another board but still wanted to put a faster CPU in this one (currently a 4800+). Does anyone have this CPU running:

AMD Athlon 64 X2 Dual Core 7850+ Black Edition

the 7750 is on there but not this one and having been burnt once I want to make 100% sure.

in fact, what CPU's are people running that are NOT in the supported CPU list?

March 11, 2011 8:12:15 PM

All you need to do is update the bios to run the CPU. From looking at the CPU support list, I see the Phenom II x4 820 is on there. Architecturally, the CPUs are 100% same. The only difference is the multiplier. Since the microcode support is in the bios for the 820, I'm sure the 840 will work. It's the same thing for the 7750/7850. The newest bios is from 2010-02-23 and will essentially support all AM3/AM2+/AM2 (Phenom II, Athlon II, Sempron, Phenom, etc...) processors except the hexacores (1055t, 1090t, etc...) Direct link is here: Alternatively you can go to and navigate through the menus.

My friend was worried that a Phenom II x3 740 wouldn't work on his motherboard because only the 720 was listed on the support list. I told him that was not the case, and flashed his bios for him, installed it, and he was good to go.
March 13, 2011 7:32:54 PM

I tried the latest bios, had no joy. Couldn't seem to get it stable. None of the supported CPU's are C3 stepping, AMD must of tweaked something.

In the end I bought an X3 435 and that works fine. The X4 820 works great in my new board.
March 13, 2011 7:35:46 PM

Edit: Meant to say "the X4 840 works great in my new board"