XMS2 Advertises Aggestive Latency?? LOL

[YoueatLard]

So, I'm looking for new ram and I happen to stumble across XMS 2 memory. It advertises this: [B]Significantly outperforms[/B] the fastest DDR speeds. DDR2 speed grades START where DDR hit the ceiling. And Matched pairs for dual channel motherboards. TwinX modules are tested in pairs, in DDR2 dual channel motherboards, at very [B]aggressive latency [/B] settings for optimum performance and compatibility. It also advertises latency settings of 4-4-4-12. What? Agressive? How is that agressive? It the scale change and are higher numbers now better? If this is true I guess I'd better start running my generic 3-6-6-8 3200 ram. I think thats the closest I can get for my money. And to think I spent all that money on Corsair TwinX 1024-3200LL for settings of 2-3-2-6

[Wired]

Considering that the only thing I've seen so far using DDR2 memory are video cards, let's just wait and see before we comment on those settings. There's nothing to compare them to as of yet.

[SpDFrek]

YoueatLard- I take it that you have done more research on DDR2 and found JEDEC specs for the parts? This would be the only way to know the latencies at which they are supposed to run versus other parts. Higher frequency parts generally have higher latencies. A trade off I will gladly take for getting 6 Gbs a sec out of the box.

[Wired]

[URL=http://www.pcstats.com/articleview.cfm?articleID=1573]Introduction to DDR-2: The DDR Memory Replacement[/URL] [QUOTE]What about Latency issues? Latency is one area where the DDR2 specs fall short of regular DDR memory, at least on paper. The JEDEC definition of DDR2 allows for CAS latencies of 3,4 or 5, as compared to DDR's 1.5,2 and 2.5. While some manufacturers have released 400MHz DDR2 at CAS latency 3, all 533MHz DDR2 chips currently shipping use a Latency timing of 4-4-4. As 533MHz DDR2 is likely to be the first widely used speed for the new standard, these are the timings that will be the default standard. Write latency is also considerably greater with DDR2. While DDR1 allows a single cycle for write latency (1T), DDR2 defines write latency as read latency-1. This means that with a CAS latency of 4, DDR2-533 should have an effective write latency of 3T. Again this seems like bad news on paper. To be fair, it may be difficult to compare DDR2 to DDR memory directly in terms of latency and performance. The various new features that DDR2 implements may make the difference in memory latency less significant. For more information, check out PCstats' great article on the benefits of low memory latency versus memory speed with respect to DDR, and for a (much) more technical examination of the latency issues of DDR2 memory, look here. As it stands, it seems unlikely that DDR2 memory will have any performance advantage over DDR of an equivalent speed. The slower speed of the DDR2 core is cancelled out by its ability to move more data each clock cycle. Manufacturers claim that the various new signal enhancement features that DDR2 possesses will add to effective bandwidth by reducing interference, but then DDR2 takes more time to perform data actions (higher latency). Only proper lab tests will decide this. Stay tuned.[/QUOTE]

[YoueatLard]

Yeah I read that PCStats.com article to Wired. I guess AMD may have to do some rethinking with they're memory layout. I'm sure you guys know what a boost this'll be for Pentiums and what this would currently mean for AMDs. To me it just seem like I'd be getting a 10k SATA hard drive with a 13 msec read/write access time. Yes the capability to move data faster is there but it'll spend more time looking for that data. I do see that I'm probably speeking a little soon on this issue considering I haven't had a chance to get my hands on some of it yet but it just hit me as strange that they advertised aggressive latency timing with the latency scale the way it currently is. Well, if nothing else even though I'm in a room with 6 AMD's maybe I'll start buying Pentium. If nothing else it'll save on my air conditioning bill. (Unless they're still fighting with they're Prescott heat issue.)

[chuckbam]

XMS2, Will this memory work on a 865 MB ?

[Wired]

AFAIK, NO motherboards are spec'd out for this memory yet.

[chuckbam]

[quote name='Wired']AFAIK, NO motherboards are spec'd out for this memory yet.[/QUOTE] Then who is buying it. It if for sale :sigh!: