800MHz CAS5 or 675MHz CAS4 - which is better?

I'm building a new machine, as follows:
Intel Core 2 Duo E6400
2 GB Corsair TWIN2X2048 Memory
nVidia 7950GT video card
Asus P5N32-SLI Premium nForce 590 motherboard

Due to budget restrictions, I'm not implementing SLI at this time, but I wanted to future-proof the system and allow myself the ability to go that route in the future.

Here's the question, I can either get memory at 675MHz (4-4-4-12) or 800MHz (5-5-5-12) for about the same price and within my budget. Which is better? Does the higher clock speed outweigh the increased CAS latency or is it the other way around?

One of the main games I'm looking to be able to play is MS Flight Sim X with all the bells and whistles turned on. The demo brings my current system to its knees!

Thanks in advance.
10 answers Last reply
More about 800mhz cas5 675mhz cas4 better
  1. I wasn't planning on doing any overclocking, but that's not out of the realm of possibilities. From the research I did, it looked like the 800MHz RAM was marginally better, but I hadn't factored in overclocking.

    Thanks for the reply.
  2. if you're not ocing the best option would be 533 with the lowest cl you can efford, 1:1 ratio with stock c2d
  3. What about DDR2 800+ and 4-4-4-12 at an affordable price? Assuming it is compatible, check, you might consider 2x1GB A-data Extreme Edition DDR2 800+ 4-4-4-12 EPP. I use it in my DS3 and have it clocked at 900MHz 4-4-4-12 2.0v. It will go higher when I get the time to push it. It is as well made as the rest, ie Corsair, OCZ, etc., with quality components. Do a search there are a few reviews. I think THG used A-data DDR2 1000 in its stress test.
  4. For C2D, memory at DDR2-800 will improve performance over DDR2-667; paradoxically, running at DDR2-533 will likely improve performance over DDR2-667. Thus, if you get the DDR2-667, try running it at DDR2-533 speed.
  5. ino, run your memory at a ratio of 1:1
  6. Quote:
    For C2D, memory at DDR2-800 will improve performance over DDR2-667; paradoxically, running at DDR2-533 will likely improve performance over DDR2-667. Thus, if you get the DDR2-667, try running it at DDR2-533 speed.


    That should probably make sense, but it doesn't. So let me ask in the shortest sentence possible.

    Huh?

    And if your board supports only up to 667, do you get 800 and crank it down, or 533 and crank it up?
  7. I have my 800Mhz (Cas 4.4.4.15) running at 950Mhz (Stock Timings) or 1000 (Relaxed Timings).

    http://www.xtremesystems.org/forums/showthread.php?t=120410

    Thight timings is ok but, there is a point where bandwidth just nullifies and actually surpasses tight timings.

    Look for specific chips Micron D9's Fattys and 1:1 is recommended but again if you up the mhz it won't matter.

    BTW i would use 965X or 975X boards, IMO Abit or Asus in that order. instead of the nvidia board.

    EDIT FOUND THE LIST. Try to get first the read colored ones or the green ones /EDIT

    EDIT 2 ATTACHED LIST http://ramlist.ath.cx/ddr2/ /EDIT :roll: :lol:
  8. That list is great, I saw it a while ago and ive been tracing down the cheapest D9GKX I can! So far its the supertalent selling for $279.
    It needs some updating from the fatbodies, ou wouldnt happend to know the author would you?
  9. Nope found it on the internet as anybody else...
  10. I think it was made by Micron themselves...
    It helps me find those hidden uber OCable chips anyways :D
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