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Help 800mhz ram vs 1066mhz ram

post #1 of 12
Thread Starter 
I'm going to go to the computer store tomorrow and i can't decide which ram to get (800mhz or 1066mhz). (gotta finish my 2nd computer which is half built at the moment)

E6600 at 3.4ghz (378x9)
250gb hard drive 7200rpm
ati HD 4850
GA-P35-DS3L

the choices im choosing between is a
53$ muskin 2x1gb 800mhz

75$ muskin 2x1gb 1066mhz.

i heard that buying the 1066mhz won't make any difference in terms of perfomance at all because my cpu's FSB is only at 378 so the 800mhz (400) is already faster then it so there will be no need for the 1066mhz unless im am able to overclock alot higher. i just want to get the input from some of the people here since you are more knowledgeable then me.
:)
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:)
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post #2 of 12
I can't really say this with confidence, but I believe lower-latency DDR2-800 memory should specifically serve you better.
post #3 of 12
I keep my bus speed on my CPU the same as the clock of my ram, both at 200 Mhz.
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post #4 of 12
Consider this mate: G.Skill DDR2 1000 2x2GB $85
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post #5 of 12
Nah, get the 1066mhz memory and run your FSB 1:1 (no OC on your memory card) this would give you lot of bandwidth, theoretically.
    
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post #6 of 12
i have a set of DDR800 RAM that runs 1.8v normally. It's currently overclocked to DDR1015 at 2.1v. Better off getting the DDR800 and see if you can overclock it
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post #7 of 12
Running 1:1 is better than overclocking cheaper RAM.

The 1066mhz memory is just better than the 800mhz memory anyway.
    
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post #8 of 12
Thread Starter 
you guys say running 1:1 is better but the thing is im not gonna go futher on my cpu overclock and 800mhz ram will still be faster then the cpu fsb so does that mean 1066 wont make a difference?
:)
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:)
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post #9 of 12
1066mhz is faster than 800mhz and generally has the same timings. (my switch from 800 to 1066 saw the same timings on each set)

1066mhz is slightly faster. People who say "oh the RAM has 400 FSB so your 378 won't make a difference" are stupid. Plain stupid. The RAM FSB is DDR2, double data rate, dual channel. The sticks for 1066mhz work at 533mhz independantly and double up to create a 1066mhz overall (this is a quick runthrough).

Anyway, the point is that 800mhz RAM will not hinder a 1066mhz CPU, nor will it hinder a 3.4ghz CPU. 1066mhz RAM will not hunder either CPU, either.

However, there is apparently some benefit in bandwidth if you were to run a 1066mhz CPU with a set of 1066mhz.

People telling you not to bother have never owned the PC8500 RAM and likely can't afford to, hence they're bitter that that RAM is faster than theirs and claw at any excuse to bring it down and deaden it. It's like the tired ATI vs Nvidia debates. One card will be faster, but for some reason the otherside find a million reasons the faster card sucks and a handful of reason why theirs doesn't.

If you've got the money, just get the bloody PC8500 RAM. It has slightly better bandwidth capabilities and since you're using a CPU that is capable of running 1:1, you may seem some bandwidth increase there.
    
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post #10 of 12
lmao@can't afford to

You must have no idea what you're talking about as evidenced by your 4x1GB setup. If you did, you'd have a 2x2GB setup.

Once your RAM's clock outpaces the FSB, performance gains are minimal and only seen with lower latency. If you take 5-5-5-15 DDR2-800 and 5-5-5-15 DDR2-1066, stick them on a board with a CPU with a 400 FSB, you'll see very, very little difference in performance. I'm talking maybe 2-3%. If you put 4-4-4-12 DDR2-800 on that same board and measure it against 5-5-5-15 DDR2-1066, you'll see greater performance with the "slower" memory.

I know this is a little over your head. How can slower RAM outperform faster RAM? Latency. If I can find the links that prove all this, I'll post it. Hopefully someone who can better articulate this will come by and supplement my argument.
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