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PC8500 or PC6400?

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November 14, 2007 9:50:20 AM

I am looking to upgrade soon and will be buying a Q6600. Now the FSB is 1066mhz so should i go for 1066mhz ram or 800 mhz. The reason i ask is that the 800mhz tend to have lower latency than the 1066mhz. So is it better to just go with some good 800mhz low latency ram or higher latency 1066mhz ram?

I want to play games on my PC so wondering which is best. I notice alot of people tend to have PC6400 memory which makes me wonder if PC8500 will make that much difference.

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a b } Memory
November 14, 2007 9:56:26 AM

Get DDR2 800 RAM, because the difference between 800 and 1066 isnt much and also DDR2 800 OCs very good

and also yes its better to go with DDR2 800 with low latency rather than DDR2 1066 with higher latency
November 14, 2007 11:23:09 AM

That 1066 FSB on the CPU is misleading. To take the real FSB of that CPU you must divide that number by 4. This gives you a speed of 267. The Q6600 will run at a FSB of 267 and a multiplier of 9. 267*9 = 2.4Ghz which is the rated speed of the CPU. This means if you aren't OCing and you want your memory to run at a 1:1 ratio with your FSB you need DDR2-533 memory. DDR2 memory doubles the data rate so you take that 533 and divide it by 2 to get 267. So you only really need to use PC4200 memory if you want.

DDR2-800, or PC6400 memory appears to be the sweetspot in memory right now with price/performance and you can find good 4-4-4-12 latency DDR2-800 memory really cheap. So I would just go grab some of that, especially if you plan on OCing. DDR2-1066 memory would be quite a waste of money, and probably performance since it would be underclocked and would have higher latency.

Hope this helped.
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October 25, 2008 1:55:30 PM

I replaced 4 GB PC5300 with 4 GB PC8500. The improvement in the computer speed is noticeable.
October 25, 2008 4:32:57 PM

The FSB on your machine is actually 266mhz, so 800mhz ram would be perfect for overclocking it.
October 25, 2008 6:40:45 PM

ssh2004 said:
I am looking to upgrade soon and will be buying a Q6600. Now the FSB is 1066mhz so should i go for 1066mhz ram or 800 mhz. The reason i ask is that the 800mhz tend to have lower latency than the 1066mhz. So is it better to just go with some good 800mhz low latency ram or higher latency 1066mhz ram?

I want to play games on my PC so wondering which is best. I notice alot of people tend to have PC6400 memory which makes me wonder if PC8500 will make that much difference.


PC8500 = DDR2 1066 mhz
PC6400 = DDR2 800 mhz
The PC8500 is 1066x8 and PC6400 is 400x8. You won't notice much of a difference in real life apps and 1066 mhz ram is better for oc'ing with C2D than C2Q because Duos are more stable at a higher fsb. For your purposes DDR2 800 is good enough even if your going to oc your Q6600. PC6400 can get you to 3.6 ghz, at that speed, its more about voltage and heat more than ram.
October 29, 2008 12:12:16 AM

Which ram would you guys pick to OC a Q9550?
October 29, 2008 8:04:45 PM

Which specific one were you talking about? The link goes to a page with 144 results on it.

I recommended 800mhz over 1066 because with a q9550, you're not going to be using the full speed of the ram. With the 800mhz ram at stock speeds, you'll be able to get the cpu to 3.4ghz. By only pushing it to 850mhz, you can get the cpu to 3.8ghz.

If you're REALLY concerned about benchmarking, getting a good 1066mhz kit would be better, but it would usually cost more, and you wouldn't notice the difference in real-world use.
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