Hmm suspected as much. Is there an easy way to check the amps on the rails?
Most power supplies have a sticker on the side indicating the amount of amps per rail. Barring that, check the manufacturer's website.
Ok had a look at both PSU's. The one machine has a AOpen 450w (http://global.aopen.com/products_detail.aspx?auno=2287) and the other a Gigabyte 585w (http://www.giga-byte.com/Products/PowerSupply/Products_Spec.aspx?ProductID=3046).
What spec PSU does the i5 require though? In terms of the amps per rail etc..
Ok according to the Intel Desktop Board DP55WB Technical Product Specification, the PSU required should be able to provide the following:
"... for a system consisting of a supported 95 W processor (see Section 1.4 on page 14 for a list of supported processors), 1 GB DDR3 RAM, one high end video card, one hard disk drive, one optical drive, and all board peripherals enabled, the minimum recommended power supply is 460 W. Table 24 lists the recommended power supply current values." Table 24. Recommended Power Supply Current Values Current Output Voltage 3.3 V 5 V 12 V1 12 V2 -12 V 5 VSB 22 A 20 A 16 A 16 A 0.3 A 1.5 A
I had my first stable run overnight with EIST/C State enabled. I raised memory voltage to 1.6v and uncore to 1.2v. Im not sure the memory raise was necessary, memtest passed with it at 1.5... I'll test more tonight.
Does Intel ever reply on these forums? I would have expected them to jump in with a couple of suggestions by now...
I'm worried that we as customers need to overclock stock standard cpu's/boards just to get it stable, I have been buying Intel products for years and never had this many issues.
I had my first stable run overnight with EIST/C State enabled. I raised memory voltage to 1.6v and uncore to 1.2v.
I bet the CPU is under volting to much for power saving.
just some feedback, the machine still reboots even on a command rate of 2T. Seems that by raising the memory voltage to 1.6v does the trick...
Ok seems it was the transcend memory modules. I got myself the Kingston KVR1333D3N9/2G modules and so far so good. Running at default settings, speedstep enabled, 1T Command Rate etc.
Thanks a lot for this info! I had these BSODs, reboots and freezes all the time with win 7 64 ultimate and win vista 64 ultimate. First I thought those were driver problems or even hardware failures, but luckily I found this forum. Now with Speedstep / Turbo Mode disabled my system runs smoothly! Turbo mode would be very nice to have, but I guess we just have to wait for a new BIOS update?!
Been having the same problem described here and switching off Enhanced Speedstep and C1 state as mentioned above seems to have "solved" the problem.
However, today I updated my BIOS (to WBIBX10J.86A.0293) and the random rebooting problem came back! This time disabling the Speedstep and C1 state does not solve the problem!
I am now tempted to manually change the voltage settings but have never done this before. Any suggestions? The current setting is 1.5V and uncore 1.1V.
Intel BIOS update = FAIL!
Very frustrating....
p.s. Note there is a similar discussion going on here:
Update: Put the RAM voltage up to 1.6V and disabled Speed Step and c1 and now is works fine.
DA
Hey guys! im running.....
Intel Core i7 2.93 GH 1156
MSI TRINERGY P55 DDR3 2133OC
CRUCIAL CT2KIT25664BA1339 4GB DDR3 x2
SEAGATE 3.5 SATA 1TB 7200. 12 32MB x2
SAPPHIRE HD5870 1GB DDR5 PCI-E
MSI ATI R5870-PM2D1G PCI-E 102
CORSAIR 1000W HX PSU modular
WIN7 PRO 64-BIT ENGLISH
I put up with this damn rig restarting/freezing randomly for 9 months.... right from when i bought it.
I tried too many fixes to list, and tested everything.
In the end i put up with it for 5 months without even trying to fix it because i was at a loss and im very new to computers.
4 days ago i decided to spend the weekend trying to fix the issue.
I can't believe this whole damn time all i had to do was change the DRAM voltage from 1.5v to 1.6v -_-!
I feel like / am such a noob lol.
So yeah, anyone thats getting random restarting/freezing that has a similar rig to me should try getting into BIOS and changing DRAM from
1.5v to 1.6v. i didn't even need to turn turbo off or mess with any other settings.
Lastly, Thanks to everyone in this post who suggested this fix! it worked for me no restart/freeze in 3-4 days XD
same randome freeze problem guys..
bsod on idle yep thats too i am facing.
ok so i have updated my bios and all the drivers on my win7 x64 are updated ..i'll increase the dram voltage to 1.6V and send you the results if that works.
Results::
tested for 4 days (movies + games + torture tests + overclocked) and i think the problem is solved..!! 
