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Confused about RAM OCing

333 Views 8 Replies 4 Participants Last post by  Jesherie, 
J
Alright, I currently have GSkill RAM DDR2 800 running at 899, with 5-5-5-15 timings. But soon, I'm getting a better mobo that supports 1066 RAM, should I upgrade the RAM, then my RAM's FSB would be 1:1 with my CPU's FSB, would that be better for OC'ing, or worse?
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A
Forget the 1:1 thing you would be above. 1066Mhz FSB w/800Mhz RAM is 2:3 ratio.

I suggest you get the new MoBo and see if you can OC your current RAM to 1066Mhz, 1:2 ratio.
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broken pixel
Quote:


Originally Posted by Jesherie
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Alright, I currently have GSkill RAM DDR2 800 running at 899, with 5-5-5-15 timings. But soon, I'm getting a better mobo that supports 1066 RAM, should I upgrade the RAM, then my RAM's FSB would be 1:1 with my CPU's FSB, would that be better for OC'ing, or worse?

I would try OC your ram first, most of the 1066 ram is just 800 factory OCed.
It is harder to OC with a 1:1 = 333/667 compared to a FSB 5:6 = 333/800 ratio, for me anyways.
I can have a OC and then change to 1:1 that lowers my DRAM freq and no boot BIOS reset time.
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ericeod
OP, you have the ability to run the ram at 1066 with the NVIDIA chipset (unlinked). I would recommend you test out the ram first. I know from personal experience that the 2x2Gb G.Skill 800 ram rated at Cas5 with 1.8v does not OC much past 930.

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Originally Posted by broken pixel
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I would try OC your ram first, most of the 1066 ram is just 800 factory OCed.
It is harder to OC with a 1:1 = 333/667 compared to a FSB 5:6 = 333/800 ratio, for me anyways.
I can have a OC and then change to 1:1 that lowers my DRAM freq and no boot BIOS reset time.

This is true. 1:1 is harder on the NB. I find running 6:5 is the best divider for me.
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J
So I should stick with DDR2 800, and OC it with a divider? Mine's currently on synced mode.
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ericeod
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Originally Posted by Jesherie
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So I should stick with DDR2 800, and OC it with a divider? Mine's currently on synced mode.

Many people talk about the memory divider as it relates to Intel chipsets. But with the NVIDIA chipset you unlink the ram and manually set the ram speed (to a certain extent). So if someone recommend you run a 5:6 divider, take 6/5= 1.2. Take your FSB speed of 400 (1600 QDR) x 1.2 = 480MHz. DDR2 is rated at double that, so DDR2 960 runs at 480MHz.

But for your testing purposes, set the ram to unlinked and type in the speed you want it to run at. Then run memtest to see if it is stable.
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A
Sounds like we are all saying see what your current RAM can do.

Eric goes on to say two important things. He says you can with current MoBo in fact raise the clocks of your RAM but warns of a possible wall at 930Mhz at 1.8v. But I think he did leave the possibility of going higher w/looser timings?

I would like to know your current RAM v?

And hey RAM is cheap so if you want buy new later no harm.
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ericeod
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Originally Posted by Asus Mobile
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Sounds like we are all saying see what your current RAM can do.

Eric goes on to say two important things. He says you can with current MoBo in fact raise the clocks of your RAM but warns of a possible wall at 930Mhz at 1.8v. But I think he did leave the possibility of going higher w/looser timings?

I would like to know your current RAM v?

And hey RAM is cheap so if you want buy new later no harm.

Yeah I didnt even mention loosening up the timings becaue 900-ish at Cas5 IMO is much better then 1066 Cas6. I find Cas6 to be crippling to ram performance.
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J
I'm actually thinking of getting some Reaper 800 RAM, which I believe OCs the MHz high, with decent timings. My current motherboard, I have no idea what timings to mess with, it gives like 50 options. Like tRas CAS Latency, stuff like that.
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