my set up

CPU
E8400(3.0GHz)@ GHz 3.65 Motherboard

P5Q-E , P45 chipset Memory
Corsair XMS2 DHX DDR2PC6400 (4 GB) Timing 4-4-4-12

Graphics Card GeForce 9600GT

Hard Drive
(2) Seagate (ST3320620AS)

Corsair VX550W 550W
Case LIAN LI PC-60BPLUSII
OS Windows Vista Ultimate x64

I am trying to overclock the Ram but I can only go as far as 407 mhz
over that, it is unstable

should I change voltage or timing
not sure what to do next


Rich Martin

check the memory divider.set it to 1:1 and try OC again.

it is 1:1 ratio

this motherboard seem to keep at 1:1

Your ram should be able to run a bit over 400mhz. Did you set vcore or is it on auto and what's your VID?

I ran into a similar problem trying to help my buddy oc his new e7200. I got it to boot at 3.6 but it wasn't stable at 1.275 volts with +2 on FSB and G(MCH). I just dropped it down to 3.2Ghz at 2.25V and had him run Prime95 for a day. Post your voltages on your cpu, ram, other voltage settings on your board. Hopefully we can help.

Set both ram and cpu voltages manually. Try cpu at 1.30 and ram at 1.86. Disable cpu spread spectrum and pci spread spectrum also.

Sometimes you will find that you just can't get over what you have got.
I say a half a gig oc is good.
Why push it to kill a computer?

cpu 1.225 V
mem 2.1 v

what should I set my NB volts to it is on auto now

You have DDR2-800, If you run the memory 1:1 400FBS the RAM will run at stock speeds. to get lets say 450 FBS you may have to loosen the timings of the RAM. If that still does not help That means you RAM cant overclock worth a damn.

The best thing to do is put the CPU at stock speeds and use the RAM multiplyer to change the RAM speeds. If you can get the RAM running stable at lsets say 5:4,4:3, 3:2, or 8:5 then you know that your RAM is not holding you back. DDR2-800 may not be stable at speeds over 400 unless you raise the voltage or relax the timings.

When I has my E6600 on the P5B I had some DDR2-667 snf I could not get it over 700(350x2) to save my life, Some people has the same RAM at 800(400x2) So just because most or some people have that RAM at lets say 1066(533x2) doesn't mean that your RAM can go that high.

1Haplo

My Q6600 G0 settings:

NB 1.30V
CPU 1.42V
RAM 1.97 (kingston hyperX 1.95V stock)

FSB 1523
RAM Synch Mode @776

Air cooling with cheapo H/S.

1.02 GHz for free, sturdy as a rock.

I suggest cranking that voltage up a bit dpending on your temps of course. These CPU's stay good up to around 70degC (full load). Much better tolerance than previous gen CPU's.

Don't be afraid to go "there".

http://www.overclock3d.net/reviews [...] _4gb_kit/3
I would set timings at 5-5-5-15 @ 2.1 volts so if there is problems you will know it's not ram. I have the same cpu and ram and whatever you will do it will be the most efficient at 3.6 ghz with ram timings 4-4-4-12 1T @ 2.1 volts. I tried 4 ghz with 5-5-5-15 timings, memory read speed was a bit slower and memory write speed was REALLY slower... so i say let it at 3.6

^
thats the fsb strap.not because of the timing.

Leave it at 3.6

Honestly, you won't see much of an improvement at 4.0GHz vs 3.6GHz.

I didn't know about it and i found a nice article but i'm confused... what would be the point of ocing beyond 4ghz and have lower memory speed? Is there a way to control that strap?

Id say loosen timings, also I know from experience Asus mobos dont like 2.1 volt ram. The like 2.0 and under. Notice the QVL theres not high voltage ram listed.

My buddy has a "P5Q Deluxe" and he had DDR2 1200 2.1-2.2 volt ram and he couldn't get his machine stable past stock.

I got him to run the ram at 1000 1:1 and drop the volts to 1.9 and now he has a stable oc of 4.5 on his e8400. He is water coole to keep temps down.

He spent big money on his ram and it wouldn't work with the stock recommended voltages. I've seen lots of Asus boards give fits with high volt ram.