Help me find the problem!

[TenEgg]

My 1.6a can run at least 155 fsb prime95 stable with 1 stick of ddr. But it can't even do 135 fsb with 2 sticks. I ran memtest with both sticks at 150 fsb 1:1 at 2.7v with all 11 tests and 10+ loops without an error. But prime95 failed in about 2-3 hrs. I tried raising vcore, still the same. I can try raising vdimm to 2.8v but don't really want to. My voltages looks alright when running prime95, so shouldn't be the power supply.

+3.3V -> 3.26
+5V -> 5.02
+12V -> 11.73


Any suggestions?

I know the easiest way is to run it with 1 stick, but I'm trying to figure out why can't it run 150 fsb when the chip and mem can do it.

 

[TenEgg]

Oh I tried all combinations on the 3 slots....same results....

 

[ChampionAtTufshop]

so each individual stick will run memtest86 for the same time period?

try turning cache on for all tests:
push the following when it starts up

c-2-3-1-2-0-space

it might also be the board, where it doesnt oc very well with more than 1 dimm populated

have you tried relaxing ram timings?
also, put voltage to 2.8 and see
it wont damage ram, especially if you only run it for a few hours

 

[TenEgg]

individually, the sticks will do 400+ ddr 2-2-2-5. The test I ran 150 fsb 1:1 at was with both sticks and at 2.5-3-3-7 already. I also turned cache on for all tests.

hmm...so it might be my board? it's IT7 m2v2.

I'll try test 2.8v tonight.

 

[LastRide]

I have the IT7 Max2 V2 also.There is a weird thing that goes on when you run ram at 1:1 on this mobo.I can't do 380DDR at 2/2/2/7 stable,but I can run 458DDR at 2.5/3/3/7 stable.I was reading in another forum about this issue.I have OCZ 512MB PC3700 one stick.Also,I don't think the memory is as stable with the IT7.I think with 2 sticks its worse.Check out this post.Its pretty long,but it might give you an insight on the problem. IT7 Link

 

[ChampionAtTufshop]

i konw it7 max (original) was an awesome board

but i think i recall some probs with max2v2 a while ago

 

[LastRide]

I love my board.Its just odd when I run 1:1 suddenly I am not stable anymore with less DDR and a little faster timing.I prefer to run it 4:5 458DDR 183FSB 3.3GHz as I am now with my 2.4B anyways.I'll have to play around with it a little more.The problem is with both IT7 Max and the Max2 board.

 

[TenEgg]

Tried 2.8v, still can't do it. Also tried lower fsb with 3:4 ratio, same results.


I guess I have to run only 1 stick if I want higher oc. I checked Evan's review again. He had 3 sticks at 333ddr....hmm....

 

[LastRide]

Try strap on low and 4:5 ratio

 

[TenEgg]

wow thanks for the advise, the 4:5 works!

ran 120 fsb = 300 ddr and prime 10hr+ stable. Testing 125 fsb now...

 

[TenEgg]

125 fsb = 314 ddr passed as well....

hmm...there is some problem with the 1:1 and 3:4 on PE chipset boards? coz I had tried it on the 8PE667 Ultra and had the same results before I tried this 4:5.

 

[TenEgg]

just got the time to do more testing...........I can't run anything over 130fsb with 4:5 either.....seems like the board just won't go over 130fsb with my 2 sticks installed.