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Mem Overclock Advice

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Last response: in Overclocking
October 5, 2010 11:58:56 PM

I currently own this board: http://www.newegg.com/Product/Prod [...] rue&Page=2 with 4gb of DDR2 800 (running at 800mhz) in it, and a Q6600 (2.4ghz) OC'd at 333x9 (3.0ghz).

I have a few questions though. DDR2 800 runs at most at a FSB of 400mhz, correct?
If so, with a FSB of 333, does that mean I am running my memory at 333x2.4 to reach 800mhz?

Also, if I were to put in DDR3 1333 on my board (DDR3 1066 is the highest supported I think), it would downclock it to 1066 automatically I think (however the website states it's compatible with 1333 models). From there, with my FSB at 333mhz, could I set the memory multiplier to x4 (which is an option) to get my memory to run at DDR3 1333?

Also, I hear something about memory voltage being close to cpu voltage, within .5 or something.

So, with my vcore 1 at 1.26v and my vcore 2 at 2.0v, what kind of voltage should I look for in memory?

I'm thinking something like this memory: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Always liked G.Skill, works on a lot of machines too.

Also, according to crucial, some of their models are also compatible that run at 1333 with 1.5v and 1.8v.

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October 7, 2010 12:03:41 AM

You do not have to run memory at its rated speed. You can run FSB 333 and set your RAM to 667 to run in 1:1 'synchronize'. Or, you can set the RAM at its rated speed of 800, and have 5:6 ratio.

Yes, you can use memory rated at 1333, but will not be able to run it at that speed due to your mobo.

Difference in .5 volts are between uncore (Integrated Memory Controller) and RAM. This matters only for newer CPUs like Core i7. Run your memory at whatever voltage its rated on. If you are running it slower than the rated speed though, you can probably get away with lower voltage.
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Best solution

a c 198 K Overclocking
a b } Memory
October 7, 2010 1:17:45 PM

I currently own this board: http://www.newegg.com/Product/Prod [... said:
rue&Page=2 with 4gb of DDR2 800 (running at 800mhz) in it, and a Q6600 (2.4ghz) OC'd at 333x9 (3.0ghz). ]I currently own this board: http://www.newegg.com/Product/Prod [...] rue&Page=2 with 4gb of DDR2 800 (running at 800mhz) in it, and a Q6600 (2.4ghz) OC'd at 333x9 (3.0ghz).

Your link is broken. I don't know what kind of motherboard you have. I am guessing from your talk of memory multipliers, that you have a Gigabyte board.



I have a few questions though. DDR2 800 runs at most at a FSB of 400mhz, correct?
If so, with a FSB of 333, does that mean I am running my memory at 333x2.4 to reach 800mhz?
said:

I have a few questions though. DDR2 800 runs at most at a FSB of 400mhz, correct?
If so, with a FSB of 333, does that mean I am running my memory at 333x2.4 to reach 800mhz?

If you start off with your memory settings on Auto, your memory clock will be increased by the same percentage as your bus freq. So your memory will be running at (333/266)*800 or DDR2-1000 speeds. Assuming you actually set the RAM clock to 800 MHz, you are overclocking your RAM a little. Core2 systems gain very little improvement overclocking RAM, and it can significantly decrease stability - exactly what you don't want if you are overclocking. We discuss that here:
http://www.tomshardware.com/forum/251715-29-ratio-myth



Also, if I were to put in DDR3 1333 on my board (DDR3 1066 is the highest supported I think), it would downclock it to 1066 automatically I think (however the website states it's compatible with 1333 models). From there, with my FSB at 333mhz, could I set the memory multiplier to x4 (which is an option) to get my memory to run at DDR3 1333?
said:

Also, if I were to put in DDR3 1333 on my board (DDR3 1066 is the highest supported I think), it would downclock it to 1066 automatically I think (however the website states it's compatible with 1333 models). From there, with my FSB at 333mhz, could I set the memory multiplier to x4 (which is an option) to get my memory to run at DDR3 1333?

If your motherboard is using DDR2 RAM, DDR3 won't fit unless you have one of the very few boards that have sockets for both. And even if you do, it's simply not worth putting that much additional money into an existing Core2 system. And a Core2 system gains very little from the increased bandwidth of DDR3 RAM.



Also, I hear something about memory voltage being close to cpu voltage, within .5 or something.
said:

Also, I hear something about memory voltage being close to cpu voltage, within .5 or something.

Not for a Core2 system. Upper limits for CPU voltage is 1.5 volts for the 65 nm CPU's. DDR2 RAM generally operates from 1.8 volts - factory default - to about 2.2 volts.



So, with my vcore 1 at 1.26v and my vcore 2 at 2.0v, what kind of voltage should I look for in memory?
said:

So, with my vcore 1 at 1.26v and my vcore 2 at 2.0v, what kind of voltage should I look for in memory?

Vcore1 is obviously CPU core voltage. I have no idea what "vcore2" represents. Your memory voltage should be set to factory recommended values.

Considering that I have 4 OC'd Core2 systems in my house:
GA-EP45-UD3P | Q9550 OC'd to 3.6 GHz (425 MHz X 8.5) C3 stepping :( 
GA-EP45-UD3L | Q6600 OC'd to 3.6 GHz (400 MHz X 9)
GA-EP35-DS3P | E7500 OC'd to 4.1 GHz (373 MHz X 11)
GA-G41M-ES2L | E6500 OC'd to 3.66 GHz (333 MHz X 11)
(yes, I like G'byte motherboards), here is what I would do:

Set your memory voltage according to factory specs. Take your memory settings of Auto and set your memory clock to twice the FSB frequency. At 3.0 GHz, your FSB freq will be 333 Mhz and your memory clock will be 667 MHz.

If you have even a mediocre cooler, you should be able reach 3.3 - 3.4 GHz. At 3.3 GHz, your FSB freq will be 367 MHz and your RAM clock will be 733 MHz.

Don't exceed 1.5 volts on the CPU cores and keep your load temps under 70C as measured with CoreTemp.
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October 8, 2010 12:20:47 AM

I have the GA-P35C-DS3R, which has memory slots for both types of RAM. But, I'm getting the RAM for 40 bucks. (2x2) 4GB DDR3 1333 G.Skill Ripjaw 7-7-7-21. I did the math and it going from (CAS 5/800) .0065 to (CAS 7/1333) .00525. Might be noticeable in terms of FPS hopefully. Either way, DDR3 for 40 bucks is nice (brother buying my old RAM to help me split the difference for this RAM).

As for VCORE2, that's my current RAM voltage, speedfan confused me :p .

Also doesn't DDR3 run at 4 times it's rated FSB speed? E.G., DDR1333 can run at a FSB of no higher than 333MHz (unless you're lucky) and DDR3 1600 is limited to 400mhz FSB?

Also, I can't individually set my RAM speeds, it has to be run by the multiplier for the RAM through gigabyte. So my FSB of 333 would do RAM at 333x4 = 1333mhz speed. Which seems ideal.
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a c 198 K Overclocking
a b } Memory
October 8, 2010 9:37:21 AM

Yes. DDR3 is clocked at 4 time FSB frequency.

But here is your problem: If you overclock past 3.0 GHz, you will need to relax the DDR3 timing, probably CAS8 at least, adding more latency. I think you won't see much difference.

But I could be wrong. :) 
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October 8, 2010 12:39:45 PM

I don't plan on it. My system doesn't get very stable over 3GHz anyways =).
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October 18, 2010 12:31:25 AM

Best answer selected by phasmantis.
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