Need help with new build

Greetings all,
I just finished polishing off a new build on Monday, and have finally settled down to see if the system is stable. Running at stock speeds (except 17x multiplier on FSB (up from 14x, plus 1:4 ram ratio as 1600ram requires 800mhz per stick)) results in a prime95 bsod in under 20 seconds. My ram timings are set at Mushkin default settings (7-7-6-18-1T). Cooling at idle is 22C on processor, 42C on video card. Under stress (Empire Total War for 3 hours) it never went above 27C. What could be causing my computer to BSOD in prime95 so quickly? Again, all other BIOS settings are at default.
My build specs are below:

Microsoft Windows Vista Home Premium SP1 64-bit
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA
AMD Phenom II X3 720 2.8GHz Socket AM3 95W Triple-Core Black
mushkin 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
SAPPHIRE Vapor-X Radeon HD 4870 1GB 256-bit GDDR5 PCI Express 2.0 x16
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  1. First off re you using the latest version of Prime95 for 64-bit OS. If not then go here and get it.

    If it still Bsod's after trying Prime95 64-bit, then it could be a number of things, like ram, graphic card drivers or Bios'. Check and see if your board has new Bios' and update to them.

    The latest Bios for the M4A785TD-V EVO BIOS is 0219 which is suppose to "Improve the system stability for sideport memory".

    Asus Download link for your Board "Bios".

    Also a good place for help is the Asus VIP Forum Users' Board, below is the one for your board.

    Get MemTest to test your Ram out to see if there is a problem there. Test 1 stick at a time at first and then both. If you have a problem then when running both during MemTest, try switching Slots to see if it that is the problem. You can download MemTest here.

    Or here from main site, that also give you info on what to do.

    Please keep us inform on your progress.
  2. Thank you for your support- Memtest ran fine (ran that on Monday night), and I have the latest BIOS.

    My current solution is to drop the FSB multiplier to x14 (as opposed to x17)- turns out x17 is unstable without a voltage boost, something I am wary to do this early in the chip's life.

    Ran prime95 for 30 minutes with no errors before I manually stopped it- drastic improvement from 10 seconds shows me that it is now stable.

    The only problem I have at this point is that Vista x64 boot time is slow (compared to XP)- but that's a common problem. Also, Empire: Total War crashes during campaign naval battles, but that is a bug with the game, not my machine.

    The only other question I have is, is the 1:4 FSB/Ram ratio too high?

    Thanks again, I'll be sure and come back if any problems pop back up.
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