your opinion on rambus and latancy

[desktopsilver]

ok ok so im a newbie,,,i read your memory guide and i see that my new p4t533-c with rambus ,,,,,well the memory archetecture has some latency isues,,,which evidently is masked by some sort of software code,,,,,,,,ok laymans terms ,,,,,each memory(memmory chip on the stick) device on the rambus rim presents a latancy issue to the cpu,,,so the new rimms comming out with the pt533 (which are really double stics of 1066) are going to have double the latency issue per rimm,,,is this correct if so wouldnt the new double rims in effect be mesurably slower?

 

[cmdrdredd]

the way i understand it...RAMBUS has more bandwidth and theoretical performance, but DDR is not far behind and sometimes even faster for some things.

You won't notie the latency anyhow...can you count to 2NS?

 

[SexyK]

The newest PC1066 32ns RIMMs have latency comparable to DDR. It's a non-issue, despite the fact that anti-RAMBUS zealots will tell you otherwise.

Kramer

 

[ToBeMe]

Originally posted by: cmdrdredd
the way i understand it...RAMBUS has more bandwidth and theoretical performance, but DDR is not far behind and sometimes even faster for some things.

You won't notie the latency anyhow...can you count to 2NS?

DDR as it stands now will not catch RDRAM in performance........that's where DC DDR will come in (hopefully) but, RD developement is not satinding still either..........

 

[desktopsilver]

bump

 

[AndyHui]

I wrote in my FAQ that additional RDRAM devices on the bus will increase latency.

However, with the aggressive prefetching and caching built into both the i850(E) chipset and processor, the latency is effectively masked, as compared to the situation with the older i820 and i840 chipsets.

In addition, as RDRAM frequency increases, the latency decreases.

Latency is no longer a factor with RDRAM.

 

[Pabster]

AndyHui wrote:

"...Latency is no longer a factor with RDRAM..."[/i]

I disagree, at least partially. PC800 still suffers from high latency compared to the DDR solutions. PC1066 vastly improves in this area, of course, but to discount the latency issue with RDRAM entirely... no. 🙂

The big thing to keep in mind with RDRAM is that latency increases as each additional device is added to the bus.

 

[dexvx]

Just wondering, whats the difference between:

Samsung 40ns PC800 RDRam overclocked to PC1066 or Samsung 35ns PC1066 RDRam.

More or less the same?

 

[Acanthus]

they will perform identical to each other at the same clockspeed (or at least they should) the ns rating on the chip is just what the factory has certified the chips to run at. 45ns is pc800, 40ns is pc866-1000ish (there is no exact measurement for 40ns) 35ns is PC1066, 32ns is PC1200. Remember that the main block in most rambus setups isnt the ram, its the controller (or DRCG, Direct Rambus Clock Generator), ive noticed that PC1200 systems SIGNIFICANTLY outperform DDR, the trick is getting it to work 🙂

 

[Athlon4all]

Forget Latency, lets talk real world performance. And in real world performance PC1066 is about 5-10% faster than 845G and DDR333.

Now about latency, I have to agree for the most part that latency is not that big of an issue with PC1066 anymore. Yes Cachemem shows that PC1066+533fsb+850e does have higher latency than DDR333+533fsb+845G(see Xbit Labs), but in real world, PC1066 is faster.

 

[EXman]

Latency is no longer a factor with RDRAM.

now it is Just Money that is a factor unless you Like exotic PC3200 DDR.

 

[ToBeMe]

Originally posted by: EXman

Latency is no longer a factor with RDRAM.

now it is Just Money that is a factor unless you Like exotic PC3200 DDR.

Really??? LOL! I wouldn't say that to loud.............DDR is going up fast as hell and most people whom are buying seem to be going for at least PC2700 and a LOT of people are buying the XMSPC3200....................considering those two, RDRAM is no more expensive in most of the better brands (Mushkin, Corsair, Samsung, Crucial) and is actually less expensive in some cases and that is looking at the prices today and DDR is expected to continue to rise according to most sites.............as of now and the near future at least price isn't much of an issue either anymore....😉

 

[Athlon4all]

On the topic of price, I have been keeping a close eye on Samsung's PC2700 and PC1066, and RDRAM still does have a hefty price increase over the best pure PC2700 names. Crucial 256MB PC2700 is $94, Samsung 256Megs DDR333 is still as low as it has been around $70. 2 128Megs of Kingston PC1066 is $70 a piece, $140 total(256MB of Samsung PC1066 is $130). So for me, the price is still a bit too high, but I will say that ToBeMe makes a good point about many ppl getting the PC3000 and PC3200, but even them arent too expensive ($80 for Kingmax PC3200, $92 for OCZ, and $114 for Corsair all these PC3200). So I dunno, to be honest if somebody is getting the Corsair, then I would lean towards spending the extra to get PC1066. But why spend money on the Corsair when you have KingMax and OCZ that are cheaper?

 

[John]

But why spend money on the Corsair when you have KingMax and OCZ that are cheaper?

People want to buy from a reliable company, not one that misleads the customer. OCZ is a crap shoot as we all know, and I have read several reports this past month where (don't quote me) Kingmax is not running it's rated speed, not to mention the horrid RMA policy. You forgot to mention Samsung Original PC2700 which is capable of running 200MHz. It is very popular around these parts. 😉