Does memory affect CPU OC?

OCP · 30 Jul 2007 at 10:51

Hi guys, I've recently overclocked my E6600 to 3.2ghz x9 multiplier - 1.45v (Bios) on my P5k Deluxe mobo with 2x 1GB 6400 Corsair Dominators @2.2v 4-4-4-12 711mhz (1:1 ratio).

I cant seem to get any higher than this. Temperature is fine according to TAT @ 35-38 idle and 48-55 load.

When I run Orthos Blend @ 3.3 ghz it stops within a few seconds. But when I run the Small FFTs CPU Stress its stable for as long as I left it on which was around 1 hour.

Could it be my memory thats holding me back?

My friend that has the exact same system apart from memory which is the Corsair 5-5-5-12 and has 3-5c higher CPU temps, can overclock his above 3.5ghz orthos blend stable??? His settings are all exactly the same as mine, I even raised my memory timings to match his!

Does the memory play a big part in this? Any help will be great.

If there is anything I missed out that you need to know to help let me know.

OCP

Columbo · 30 Jul 2007 at 11:04

Memory does play a massive part in overclocking, though in this case it should'nt because its actually underclocked.

What maybe holding you back is your FSB speed. What is it set at?

Some CPU-Z screenies would be nice to help you further.

Example of mine is my multiplier is set at x7 and my FSB speed is 460 giving me a CPU speed of 3220mhz (3.2ghz).

Because your RAM speed is a reflection of your FSB speed you have apply some sort of control over it. To do this on my Giga DS3, i set my memory FSB multiplier to x2. Setting my RAM to 920mhz.

In short, it may be advantageous to increase the multiplier and lower your FSB speed.

OCP · 30 Jul 2007 at 11:17

Hi Mancubus, I'm not at home atm to check exactly what my settings are. Can the FSB be figured out with the numbers I've given? Oh the multiplier is set to 9x and so is my friends.

Also, do you know if theres any reason why my friends system would run better than mine?

Thanks,

OCP

Marse · 30 Jul 2007 at 12:18

I’m just trying to sort out clocking but with a speed of 3.2 GHz and multiplier of 9 I would have thought your FSB was 356.

bloodline76 · 30 Jul 2007 at 13:07

All chips arent going to be the same despite what it says on the tin

V|per · 30 Jul 2007 at 13:42

Marse said:
I’m just trying to sort out clocking but with a speed of 3.2 GHz and multiplier of 9 I would have thought your FSB was 356.

that would be correct, which means, if the computer is fine when orthos is doind small ftt's, then it's more than likely a ram issue, which isn't looking too good, as you ram is actually running less than stock speeds... i would try memtest on each ram stick to see if they are ok, if not, it could be RMA time...

Chronictank · 30 Jul 2007 at 14:21

OCP said:
Hi guys, I've recently overclocked my E6600 to 3.2ghz x9 multiplier - 1.45v (Bios) on my P5k Deluxe mobo with 2x 1GB 6400 Corsair Dominators @2.2v 4-4-4-12 711mhz (1:1 ratio).

I cant seem to get any higher than this. Temperature is fine according to TAT @ 35-38 idle and 48-55 load.

When I run Orthos Blend @ 3.3 ghz it stops within a few seconds. But when I run the Small FFTs CPU Stress its stable for as long as I left it on which was around 1 hour.

Could it be my memory thats holding me back?

My friend that has the exact same system apart from memory which is the Corsair 5-5-5-12 and has 3-5c higher CPU temps, can overclock his above 3.5ghz orthos blend stable??? His settings are all exactly the same as mine, I even raised my memory timings to match his!

Does the memory play a big part in this? Any help will be great.

If there is anything I missed out that you need to know to help let me know.

OCP

bump up your NB voltagei had the same problem but insufficient cooling to keep the nb to the temp i would like

OCP · 31 Jul 2007 at 01:01

Thanks for the info guys. I will test out my ram and see what happens. I'll borrow my friends ram to test on my system too. I'll also try upping the NB see how that goes down.

OCP

mlpk · 31 Jul 2007 at 01:18

That is the best decision. Then you can rule out problems easier.

OCP · 31 Jul 2007 at 03:48

While I'm here, does it make any difference if I purchase 2 seperate 1gb sticks of crucial ballistix rather than the 2x1GB crucial ballistix KIT?

OCP

thegoonden · 31 Jul 2007 at 04:46

OCP said:
While I'm here, does it make any difference if I purchase 2 seperate 1gb sticks of crucial ballistix rather than the 2x1GB crucial ballistix KIT?

OCP

It can do, because , each stick varies slightly. Those sold as matched pairs are verified to be happy at the same clocks speeds and voltages as one another. If you buy separately, you may end up with an imbalance, and when one stick is happy, the other is under or over volted, or otherwise unhappy.

OCP · 31 Jul 2007 at 05:16

ah, I see. What happens if I buy 2 kits (4GB) will 2 different kits have compatibility issues?

Buckster · 31 Jul 2007 at 07:20

I wouldn't worry about NB volts too much ...

I'm currently on 374x9 with my E6600 (at 1.55Vcore - gulp)

BUT - VNB (MCH) = 1.45V and VFSB = 1.3V - no problems

Mark.