New Posts  All Forums:Forum Nav:

laptop memory question

post #1 of 4
9/13/06 at 6:00pm
Thread Starter 
Does anyone care to speculate as to why there is no supplier for 667Mhz CAS4 sodimms?? The individual chips exist, many manufacturers use them or even faster on their products for the full size DIMM slots. From any research I have been able to do, it seems the laptop boards could take advantage of the improved timing, so why are there no suppliers for the boards??

533 Mhz CAS4 and 667 MHz CAS5 are pretty much a wash for speed it seems, so lets have some 667 MHz CAS4 already.

Give some of the memory love to us lappie users
Reply
Reply
post #2 of 4
9/18/06 at 1:46pm

whats the point

IMO I don't think there is any point in providing memory which may cause the system to go unstable as in the bios of most laptops you cant alter any settings for the memory which you install. Im running my laptop with a pair of sodimms, which i brought from my local PC world and the difference in price between 533 and 667 was negligible so i brought the 667 because my processor is a T2300 and to put 533 dimms in would be to slightly limit the bandwidth, sure the cas on my dimms are 5 and not 4 but my machine has run reliably without any crashes and that to me is more thsn fair trade-off considering my laptop is dirt cheap and has no extras options at all
Reply
Reply
post #3 of 4
9/20/06 at 5:00pm
Thread Starter 
The point is, the laptop already support CAS4, and it already supports 667Mhz. 667 (and faster) memory at CAS4 exists, and from what research I have done, it appears the MB in the e1505/6400 would be able to take advantage of the combination of 667Mhz at CAS4. Stability is a moot point as the memory doesn't even exist in sodimm form. Also, this would not be a "overclock" as the bios would recognise the memory from the ID and set things appropriately.

Why do it? because there is performance to be had, expecially when the video card is using system RAM. CAS4 at 533 is equivalent to CAS5 at 667. CAS4 at 667 is the only way to see an increase. Your putting faster bus speed dimms in was effectively negated by the CAS increase.

I am glad that you are happy with your machine, but what you consider a fair trade-off may not be everyone's opinion.
Reply
Reply
post #4 of 4
9/20/06 at 5:59pm
I would have to agree with the original poster. 667MHz CAS5 memory has little to no performance increase over 533Mhz CAS4. It pretty much defeats the perpose for spending the extra dollar to switch to faster memory.

As for lower CAS latency causing instability, I would have to disagree. If the memory is designed to run at a certain speed/latency, then it will run at that speed/latency just as stable as any other memory as long as the rest of your hardware supports the faster memory. Only time you'll see instability issues is if you lower the latency or up the speed on modules not designed to do so.

As for where to get the faster memory, that is a good question. Maybe try performance laptop manufacturer's factory upgrades such as Alienware? Probably pay high dollar for them but I'm sure someone must carry them.

EDIT: After speaking with a Alienware Rep, they get their modules from Apacer, Rambus, and Corsair. This link may answer your question. http://www.neoseeker.com/news/story/5366/
Reply
Reply
New Posts  All Forums:Forum Nav:
  Return Home