Reboots during Prime95

[killerpcs]

I have an E2140 running on an Abit IP35-E, have just started OC'ing it to see what I could get. Left at stock voltage, I hit 2.8Ghz (350 fsb) with no problems, Prime95 ran for several hours, no hiccups, highest temp reported by core temp was 54C.
The next attempt, 3Ghz (375 fsb) got reboots within 10 minutes of running Prime95. Are the reboots a sign of needing more voltage to the CPU, or is it something else? I did try a second run putting the voltage up to 1.345, but still get the reboots.
I left the memory voltage on auto, the ram I am using is 2X1Gb Crucial Ballistix, running the auto timings on them as well.
To see 3 Gig, do I need to push the CPU voltage up in the 1.35 to 1.4 range? Only other thing I can think to throw in is the chip is an M0 stepping, if that matters. Thanks for any help, last time I did some OC'ing was the 300A days, so I am not quite up on the current methods

 

[myocardia]

Lower your RAM speed down to 1:1, that's what usually causes reboots, especially when people don't have Windows setup to not reboot, when there's a BSOD.

 

[Billb2]

Originally posted by: killerpcs
...I hit 2.8Ghz (350 fsb) with no problems,
...The next attempt, 3Ghz (375 fsb)

You want to slowly overclock. CPU jumps of 25mhz at a crack is asking for trouble.

You want to isolate the motherboard, CPU and memory speeds and see what their limits are individually. That way, when an OC fails, you'll know what the problem is. For example, you're raising CPU voltages and the problem may be memory voltages. Once you know what all the parts can do individually, you can put it all together into a stable overclock.

 

[SerpentRoyal]

Use 1:1 memory divider. Rase Vcore to 1.4. Retest with Orthos.

 

[killerpcs]

Thanks for the responses, the memory is currently running at 1:1. I moved the voltage back to default and dropped the OC to 2.9 G and it ran an overnight prime95 with no errors. When I have time I will try as Serpent suggested, move the vcore up to 1.4 and retest.
Since the memory is rated for 800, and at 375 its only running at 750, is memory still a possible problem? I have seen some mention of ram needing a specific voltage depending on the make/model, cpu-z says the SPD wants 1.8 volts for the timings the bios has it set at right now.
thanks again,
Dave

 

[nyker96]

Originally posted by: killerpcs
Thanks for the responses, the memory is currently running at 1:1. I moved the voltage back to default and dropped the OC to 2.9 G and it ran an overnight prime95 with no errors. When I have time I will try as Serpent suggested, move the vcore up to 1.4 and retest.
Since the memory is rated for 800, and at 375 its only running at 750, is memory still a possible problem? I have seen some mention of ram needing a specific voltage depending on the make/model, cpu-z says the SPD wants 1.8 volts for the timings the bios has it set at right now.
thanks again,
Dave

You mem is ok if you do 1:1, but if you need 1.4 for a 3ghz OC, might as well leave it default and run 2.9G probably lot cooler.

 

[SerpentRoyal]

I would dial in 2.0Vdimm and 5-5-5-15-2T timing.

 

[VirtualLarry]

So E2140s are being produced in M0 stepping now too? Did you get yours from NewEgg?

 

[killerpcs]

Larry, yes it was a newegg purchase, a couple weeks ago.

 

[SerpentRoyal]

Originally posted by: killerpcs
Thanks for the responses, the memory is currently running at 1:1. I moved the voltage back to default and dropped the OC to 2.9 G and it ran an overnight prime95 with no errors. When I have time I will try as Serpent suggested, move the vcore up to 1.4 and retest.
Since the memory is rated for 800, and at 375 its only running at 750, is memory still a possible problem? I have seen some mention of ram needing a specific voltage depending on the make/model, cpu-z says the SPD wants 1.8 volts for the timings the bios has it set at right now.
thanks again,
Dave

Only way to find out is to run Memtest86, test#5 for 50 loops.