High Speed DDR2: Buffalo and Crucial Deliver 1000+
by Wesley Fink on July 7, 2006 12:05 AM EST- Posted in
- Memory
DDR2 400 (4:3) Performance
With a CPU rated at 1066 FSB (Quad 266), DDR2-400 is an underclock ratio for memory. It is not likely users would want to run at this speed unless they have very old DDR2 memory that cannot run at faster speeds at tight timings. This speed is included mainly for reference - to compare tested memory to past DDR2 memory performance.
All three DDR2-1000 memories can handle DDR2-400 at the fastest timings you can select in memory at 3-2-2. This low-latency performance is reflected in PC2-8000 outperforming all the previous DDR2-400 performance charts. You can compare to earlier DDR2-400 test results here.
With a CPU rated at 1066 FSB (Quad 266), DDR2-400 is an underclock ratio for memory. It is not likely users would want to run at this speed unless they have very old DDR2 memory that cannot run at faster speeds at tight timings. This speed is included mainly for reference - to compare tested memory to past DDR2 memory performance.
All three DDR2-1000 memories can handle DDR2-400 at the fastest timings you can select in memory at 3-2-2. This low-latency performance is reflected in PC2-8000 outperforming all the previous DDR2-400 performance charts. You can compare to earlier DDR2-400 test results here.
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Wesley Fink - Monday, July 10, 2006 - link
Crucial has advised AnandTech that "all of Crucial's memory products come with a lifetime warranty". We have updated the review to reflect this information on the Crucial warranty.MacGuffin - Saturday, July 8, 2006 - link
It should read DDR2 1067 (1:2) Performance.
This needs to be fixed on Page 10, along with the link on Page 9 that points to page 10, and the Article Index drop-down list.
Excellent Review, nonetheless.
JarredWalton - Saturday, July 8, 2006 - link
Fixed, thanks. :)PLaYaHaTeD - Saturday, July 8, 2006 - link
I thought since the front side bus of the 965 is 1066, it would be the 'Holy Grail' to have the memory running at 1066 as well. Wouldnt this make it synchronous again? What am i missing?MacGuffin - Saturday, July 8, 2006 - link
Synchronous Operation (meaning FSB:DRAM Ratio at 1:1)266MHz FSB -> 266MHz RAM Speed -> 533MHz DDR2
The 1:2 Divider (which isn't synchronous) yields 1066MHz
266MHz FSB -> 533MHz RAM Speed -> 1066MHz DDR2
Am I right or have I gotten it wrong? I haven't used Intel since I got this Socket 754 I am typing on.
poohbear - Friday, July 7, 2006 - link
hello, just wanna clarify if the a64 can actually use any of the extra bandwidth provided by ddr2 800+? is it only for bragging rights or is the a64 actually saturated for memory bandwidth & therefore this higher bandwidth provides performance improvements? thanks in advance.Wesley Fink - Friday, July 7, 2006 - link
The A64 does exhibit tremendous DDR2 bandwidth with the on-chip DDR2 memory controller, and memory bandwidth continues to improve as speed goes up. However, as we found in our testing of the AM2 in the DDR2 vs. DDR article, the AM2 design is not memory bandwidth starved, and the extra memory bandwidth makes almost no difference in real-world performance on the current AM2 platform. The improved memory bandwidth may make more of a difference in future AM2 designs.lopri - Friday, July 7, 2006 - link
I thought this issue was mentioned in the article but I couldn't find it when I re-read it. I know on intel system the memory running slower than 1:1 will result in small penalty, but how about memory running faster than FSB? I vaguely remember that I've heard somewhere it's better than 1:1 cause that way memory "pushes" or "rushes to" FSB. Another theory I've heard is that faster memory can make up for possible performance loss on FSB subsystem, leading to less CPU idle time. According to this review, regardless the ratio, the performance seems to increase linearly to memory speed increase.So the questions being:
1. Is 1:1 the most ideal ratio without "waste"?
2. Or a slightly higher memory speed than FSB (such as 4:5) better than 1:1, preventing possible CPU idle time and "pushing" the data at the same time?
3. Or under the same CPU/FSB speed, the faster the memory the better the performance - indefinitely, taking advantage of faster memory speed?
I would think No.3 doesn't make sense because of the very FSB. In the end the FSB has been what's limiting both CPU and memory on Intel system. How could the performance get benefit from 3:5? In an ideal world there should be waste of 2. (5 - 3 = 2) Is the performance even better with 1:2? I can't imagine the FSB system being only 50% efficient, but is that the case?
Gary Key - Saturday, July 8, 2006 - link
Lopri,Please email me about this subject. Short story is 1:1 or 4:5 are your best ratios for the Intel platform at this time although this will change depending your choice of Conroe model. We will go over this in more detail shortly and I will respond here further once I complete some article testing.
Thanks,
Gary
Locust - Friday, July 7, 2006 - link
Very good article, but I have a question. How come you guys did not review Corsair's PC8500 memory modules. I have been using 2GB kit(2x1GB) for over a month and getting timings comparable to OCZ's. DDR2 800 runs at 3-3-3-5 memory settings on same mobo.Best si DDR 1000 @ 4-4-3-8 @ 2.2 recommended voltage.
Good to see more vendors offering these memory speeds, now let's just hope prices will get under $400 :-)