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1066MHz need to always manually set from 800MHz

  • Memory
  • DDR2
  • RAM
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Last response: in Memory
December 30, 2008 9:45:38 PM

Hi I was wondering if you bought DDR2 RAM which it was advertised at 1066MHz, that you had to manually set it to 1066MHz by increaseing the voltage from 800MHz. Is this true for all DDR2 RAM advertised at 1066MHz?

And if you get DDR2 RAM advertised at 800MHz are you always going to have the possibility to set it to 1066MHz?

To stay on the safe side you buy ram advertised at 1066MHz instead?


More about : 1066mhz manually set 800mhz

December 30, 2008 10:17:17 PM

Also does ram at 1066MHz give you more then enough head room to over clock my E8500 to 4.3GHz?
a b } Memory
December 30, 2008 10:28:21 PM

You don't manually set it to 800MHz by increasing the voltage. You might have to manually set it by changing the FSB:RAM divider. If you have DDR2-1066 ram, there should be a SPD setting for 1066, so change the divider first.

If you buy 800MHz ram, you will have the possibility to overclock it to 1066. Its not a given, but most ram should be able to get there.

As for your last question, it depends on your system. The newest AMD CPUs like 1066MHz ram I think, but Intel CPUs really don't need anything over 800MHz. (the newest i7 ones do, but thats a different topic.) DDR2-800 allows for a overclock of the FSB to 400MHz. DDR2-800 can usually hit 900MHz, so your top end for the FSB is going to be around 450MHz. (1800 effective.) Unless you are planning on hitting a FSB overclock higher then 450MHz, DDR2-800 is fine. (if you didn't understand any of what I wrote, just buy 2x2GB DDR2-800.)
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a b } Memory
December 30, 2008 10:35:03 PM

Ahhh, so now we get some details.

E8500 = 45nm, 3160MHz clock speed, 333MHz FSB. 3160 / 333 = 9.5 CPU multiplier.

4.3GHz = 4300MHz. 4300 / 9.5 = 453.

Your cutting it close there, but name brand DDR2-800 should be able to do that. Try to avoid the cheap stuff. If you are worried about buying some that can't get there (and again, nearly all should.) buy the 1066.
December 30, 2008 10:35:14 PM

I did understand buy shouldnt i go for 2x2gb DDR2-1066? Increased system performance. I know its not much maby less then 1% but its still better. I saw game benchmarks and 1066 over 800 gave 3 more fps.

What are the advantages and disadvantages of 800MHz DDR2 RAM?
What are the advantages and disadvantages of 1066MHz DDR2 RAM?

Like for example can they both get the same timings at 800MHz(can the 1066 get the same timings as original 800 DDR2 RAM.)

December 30, 2008 10:39:47 PM

"If you are worried about buying some that can't get there (and again, nearly all should.) buy the 1066."

Im looking to get the G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory - Retail has over 600 reviews.

Would you expect it to be compatible with a P5Q-E motherboard. Its not on the list at the G.Skill offical site, under the qualified motherboards.
a b } Memory
December 30, 2008 11:06:05 PM

You should go for 2x2GB DDR2-1066 if you can use that speed. Putting your FSB to 453 so you can hit 4.3GHz might make use of that speed, but DDR2-800 can also probably do it. Most of the time, the increase in cost by moving to DDR2-1066 isn't worth it.

That ram however is $50. I vote for might as well. It seems to be the same ram that G.Skill has that is DDR2-800, but with relaxed timings and more voltage to get it to DDR2-1066. Its good stuff, should work.
December 31, 2008 3:16:28 AM

K by the way ive ordered a P5Q-E, heard it can go over the 500 wall
December 31, 2008 3:24:27 AM

You think i should get this more expensive ram over the one i was going to get Prices are in NZ dollars. Live there. The more expensive one just seems to be better for overclocking, with lower voltages and better cooling. But you think its worth it? $16 nz dollars difference or $13 on a diffenent site for better overclocking. Though I dont want to waste any more money. Im building a full PC with a new monitor key board and mouse, everything. I dont even have the extra money to get speakers, so i got to use earphones/headphones. Even if I do get the more expensive ones, the cheaper ones could still overclock further ay? Just the luck of the draw.
December 31, 2008 3:44:56 AM

a b } Memory
December 31, 2008 11:24:04 AM

The timings are actually the same, and neither one has the voltage listed. The first linked ram seems to just have better heatspreaders. I'd probably save my $$$ and get the second ram.