Originally Posted by intelfan
Since my Ballistixs crapped out, I need some new ram. I need two 1GB sticks PC6400. It has to overclock well and be stable as a rock. Not too expensive please. I'm thinking Corsair Dominators? Are they good?
Thanks and rep+.
These are just about the best 2x1GB sticks still on the market, but they're backordered: Team 2x1GB DDR2 667 3-3-3-8-1T
(guaranteed Micron D9GMH)
When it comes to memory, it's not about the brand name it's about the IC's inside the RAM. Example: the Corsair XMS2 someone posted had Micron D9GMH IC's in the first few editions, then Corsair replaced them with junk that doesn't overclock well. Those Team sticks will work at incredibly tight 3-3-3-8-1T timings at DDR2 667 speeds, and will overclock to over 1100MHz with 5-5-5-15-2T timings. Give Tank Guys a call and ask if they're getting more in stock. We even have a Tank Guys vendor representative
in these forums.
If you cannot get those sticks, I vote G.Skill too. They overclock alright in my experience and have been dependable for me.
Originally Posted by intelfan
One last question. When people say the ram runs at 1000mhz, does that mean that's the FSB? I think I need better ram to get my bus speed to 291 for the FSB to be 1164Mhz.
Will the Dominators reach 1164 fsb?
So the D9 are double sided?
I'm going to bed. Will check thread tomorrow and give rep. Thanks again.
No, the speed of the memory (i.e. DDR2 1000) does not shed any light on the speed of the FSB without also knowing the FSB:memory ratio.
The speeds are confusing, so I'll do my best to walk you through this. The FSB is "quad pumped". The number in the BIOS might say something like 333MHz, and that's the actual speed, but the FSB "behaves" like an old FSB running at 4 times as fast as that, or 4 x 333 = 1333MHz. So Intel might report a 1333MHz FSB for a CPU or motherboard, but the real number is 333MHz.
RAM is equally deceptive. DDR and DDR2 actually run at half the marketing speed. So DDR2 800 actually runs at 400MHz, but it transfers data both on the rise and fall of the signal (SDRAM just transferred on the rise) so it behaves like SDRAM memory running at 800MHz. Confusing I know.
So what does this mean to you? You actually want the memory to run 1:1 with the FSB or faster. So take DDR2 1066 as an example. It's actually running at 1066/2 = 533MHz. That's way faster than you'll ever get the FSB. Most motherboards can only go as high as 400-450MHz on the FSB.
Basically push your FSB and CPU as far as they'll go. Say you get 400MHz as the max. Then you want your memory to run at DDR2 800 or faster. DDR2 800 operates at 400MHz (800/2), which is the same as saying it runs 1:1 with the FSB. It's ok and sometimes beneficial to run the memory faster than the FSB, such as a 1:1.25 ratio (4:5), which would give DDR2 1000 speeds, or 1:1.33 ratio (3:4) which would give DDR2 1066 speeds.
Now at these higher speeds, you'll usually have to loosen the timings. The slower timings can sometimes offset the gains in MHz, but Intel systems generally prefer higher MHz with higher timings than lower MHz with lower timings.
As for your other questions, will Dominators reach DDR2 1164? They might if the have Micron D9GMH IC's, I'm not sure if the current version does or not. For the price they better.
Are D9's double-sided? Sometimes. Micron D9 is an old inaccurate way to describe Micron D9GMH and other top performing Micron D9 chips. These high performers were less dense so yes the 1GB sticks in 2x1GB sets were double sided. However, there are many types of Micron D9 IC's, not all are D9GMH, and not all perform anywhere near as well. For example, many 2x2GB sets contain Micron D9HNL, which are single sided sticks in the 1GB form, double sided in the 2GB form. D9HNL don't overclock anywhere near as well. As a general rule, a double-sided 1GB stick that is known to have Micron D9's are likely Micron D9GMH.Edited by durch - 10/9/08 at 6:21am