Gigabyte GA-EP45-UD3 Reboot Loop

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ultimatevenom

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Oct 2, 2009
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I have just built a new machine:

Qty. Product


3 x Samsung 1TB 7200rpm SATA II HD103UJ
1 x Thermaltake DH102 Digital Home Theater Media Case
1 x Intel Core2 Quad Q9650
1 x Gigabyte GA-EP45-UD3
1 x Gigabyte GeForce 9800GT SilentCell 1GB
1 x Thermaltake EVO_Blue 750W
1 x Samsung SH-S223B DVDRW OEM
1 x Corsair TWIN2X4096-8500C5D 4GB (2x2GB) DDR2

When the computer powers on the bios displays cpu and ram count, then stops for 1 - 3 seconds, then reboots and does this over and over until it finally boots. maybe 1 in 15 times. the first thing i noticed, is when it succesfully boots, it shows (under ram count) something about the Dual Channel Ram (not an error).

Taking one of the ram sticks out seems to make the computer boot fine.

When it has booted, a few times, windows has blue screened aswell giving me an error about USB IRQ.... is this related?

is this an issue with ram voltage? bios defualted it to 1.8, i read that corsair was supposed to be 2.1, changing this did not fix the reboot loop.

i also noticed the bios had also gimped my CPU, was 8 x instead of 9 x (i think), either way it had set it to 2.83ghz instead of 3ghz

any ideas how i can get the rig going reliably, without taking one of the ram sticks out?
 
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Read over this thread and follow the links Bilbat posted to other related threads.
http://www.tomshardware.com/forum/263944-30-post-time-board

Be sure you have chosen Optimized Defaults in the BIOS, then go back and adjust as you wish.

Remove any USB devices before turning on computer to make sure they aren't causing.

Look up your Corsair RAM at their site, getting exact specs for voltage. If it says 2.1V, might try 2.2V to test.
 
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Trying to set ram correctly what does the "2T" mean in 5-5-5-15-2T at 2.1VDIMM
Bios also has other ram voltages set at 0.90V, should i just leave these? (i'm not really looking to overclock this rig)
 
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The 2T is the Command Rate - leave at 2T or don't change it.

For now though, the Auto settings on the RAM timings should be fine. Need to test with simply the 2.1V changed.

No idea about other RAM voltages, nothing should be in the 0.90V range. The default for your board should be 1.8V.

What is your exact model GA-EP45-UD3__ and rev. #
 
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OK, when I search at Gigabyte's site I get:
Socket 775
GA-EP45-UD3L (rev. 1.0), GA-EP45-UD3LR (rev. 1.0), GA-EP45-UD3P (rev. 1.0), GA-EP45-UD3P (rev. 1.1), GA-EP45-UD3P (rev. 1.6), GA-EP45-UD3R (rev. 1.1), GA-EP45-UD3R (rev. 1.0)

A program like CPUz from www.cpuid.com is handy for much of the stuff you're doing and should also be able to identify the motherboard exactly.

Oh, the thing it says about Dual Channel on POST might be about "Unganged" - this is normally better than "Ganged" for 2 modules of RAM.

Hope things are going well with the errors!
 
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Mongox, you're going to be good at this - I can tell! And you'll find it peculiarly rewarding; not only are most people overjoyed to get some actual support (especially if they've already dealt with GB tech - I have a collection of garbled, nonsensical answer from them), but you'll learn really interestin, and often useful, stuff - just yesterday, I gave someone some advice about 5.1 audio channel setup, when in the process of a bit of research, I learned that RealTek had new drivers available for both my CODEC, and my LAN, that haven't yet been 'picked up' by either MS Update, or GB's driver DL page...

Couple pointers:

Ganged vs. unganged is only an issue for AMD chips; the Intel northbridges automatically 'shift into' dual channel mode, based on discovery of two channels of DIMMS - that's why it's important to follow the manual's directions re placing DIMMs in proper slot pairs. Also, if you ever come across any actual testing of 'ganged vs unganged' (prefferably 'application suite' testing, but at this point, any hard numbers would be a godsend), please - post it! I've seen both ways extolled, but never any numbers!

Excellent place to 'look up' GB MOBOs - it's 'aimed' at 775s, but if you notice, to the left, you can select any socket and get a similar page:
http://www.gigabyte-usa.com/Products/Motherboard/Products_List.aspx?VenderType=Intel&CPUType=socket+775#Intel%20X48

Also, I think you've seen this, but wasn't sure - LSD and his merry band at TweakTown keep this astutely maintained page of testing/overclocking/stressing programs:
http://forums.tweaktown.com/f69/latest-overclocking-programs-system-info-benchmarking-stability-tools-30530/
 
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OK, didn't know about the AMD > ganging up.

And thanks! Actually, I've been leaving the Gigabyte stuff mainly to you - been trying to at least post one answer to those not getting replies in the Memory and Gen. Motherboard forums. I may read a few threads with answers but not post, but I try to make sure everyone gets at least a reply that makes sense when the other posters pass one by.

Ya know I've been busy, pushing 500 posts already! Tech/Online has its own pull-down menu from my Netscape now - got a lot of things I refer to a lot or post for others, like the prog list, Wiki's Latency page, PS calculator...
 
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The ram message says "Memory Runs as Dual CHannel Interval"

seems i now have new problems....
When bios finally lets the computer boot, it says "loading DMI POOL" and goes to a black screen and gets stuck

when booting from the windows cd it starts to load then i get Blue screened and message is "BAD_POOL_HEADER"
 
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Nope, not underclocked, bios was restored to defualts (except ram to 2.1V)

System is still having reboot loop issue.

Also has PFN_LIST_CORRUPT now, but i think that was because of a SP 1 for Vista...
 
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dont know if this helps at all.. but if the computer has booted (after 10 - 15 reboots) and it restarts. it seems to boot fine everytime. it seems to only get stuck in reboot loop on a cold boot.
 
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nope, no USB's at all. not even the front usbs are plugged in the mobo...

56 did seem high to me for no load too... i'm just out of ideas...

maybe i should run another mem test? it was noted the cpu was underclocked.... how do i fix this?
 
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Heck, 886 errors? Don't bother posting the details!

Test each RAM stick by itself. If one has errors by itself, return it. If both have errors, by itself, return both. If both have errors together, return them both.
 
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althought it seems odd that with 886 errors the computer would function at all...

what settings do i need to change to have my CPU not underclocked?


i will try mem test on a working machine with this ram as well. just to eliminate the mobo.
also try working ram in this system to see the result.
 
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