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1:1 ratio vs higher mem clock

Last response: in Overclocking
July 19, 2010 10:53:38 PM

I know this is an age old question, but just in terms of my first overclock

I have these stable settings on a GA-X38-DQ6:

Q6600 @ 3240
Multiplier: 9x
FSB: 360
Mem Strap: 2.50A
Mem clock: 900Mhz (4x 1Gb Corsair dominator PC8500 rated 1066 5-5-5-15)
Timings: 5-5-5-15
DDR: +0.3v
MCH: +0.1v

I am wondering though if I should just flick the settings over to this to get a 1:1 - can I just up the FSB to 400Mhz on this motherboard without any issues?

Q6600 @ 3200
Multiplier: 8x
FSB: 400
Mem Strap: 2.00D
Mem clock: 800Mhz (4x 1Gb Corsair dominator PC8500 rated 1066 5-5-5-15)
Timings: 4-4-4-12
DDR: +0.3v
MCH: +0.1v

Which is the better option?

More about : ratio higher mem clock

July 19, 2010 11:28:25 PM

the 400 FSB is better since it lets data get to and from the Ram faster however the chipset and the CPU will heat up more so make sure you have good cooling and check temps and stability
July 19, 2010 11:30:24 PM

Cheers for that I'll give it a go tonight.

What I can't understand is - surely the X38 is rated to handle 400FSB? (My GA-X38-DQ6 says it handles 1066/1333/1600 wihch is 266/333/400).

So I figure at 400FSB and 800Mhz RAM with 3200Mhz CPU I am only overclocking the CPU?

Or is this wrong?
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July 19, 2010 11:48:37 PM

Thats correct. It will still increase the temps of the chipset but that shouldnt be a problem.

Increasing the CPU FSB from 266 to 400 is the part thats harder to achieve, some Q6600 can do it others cant its worth a shot I would say as long and you dont overvolt too much and doesnt get over 70 C or so.

July 19, 2010 11:57:00 PM

ok i'll give it a go tonight

The FSB is already at 360 with the CPU voltage just up one notch in the options (from 1.28750 to 1.29375)

I put it up one notch because prime95 failed a test after 3 hours at lower settings.

So hopefully I can go upto 400FSB, change the ram divider to 2.00D and initially have the timings at 5-5-5-18 but then go to 4-4-4-12 if things are looking good.

The MCH temps have been around 27-30 idle and 35-40 load (though that is just with prime95 and unigine - I think the MCH may go higher - around 50 when playing games - it did that at stock)
July 20, 2010 1:38:01 AM

Thats a really nice voltage, I have my 45 nm E8400 at that voltage to get to 3.6 ghz (400 x9). You can go up to 1.35 - 1.4 V easy with a 65 nm CPU. Assuming CPU cooler is good.
July 20, 2010 1:57:06 AM

I am tempted to try for a higher overclock given that the voltages have been so good and the temps are good (I have a good cooler).

But it is winter here so the ambient temps are low.

10h of prime95 max heat test plus unigine heaven looping and the max temp I have hit is 45C on the CPU (max core temp 55C). It just depends whether the extra 400mhz from 3.2-3.6 is worth long term stability as things seem fairly rock solid at 3.2.