RAMBUS 4X

[Guest]

Talked to a rambus engineer a few days ago , about some questions we had about overclocking,
his responce was you can do it, to about 900mhz
BUT, HE THEN TOLD ME TO WAIT BECAUSE SOON THEY WILL RELEASE

their QRSL Quad Rambus Signaling Level technology. QRSL is capable of providing 12.8GBps of memory bandwidth on a 64-bit wide bus, or 4 times the 3.2 GPS now ..

that is some serious bandwidth for NOrthwood CPU P4

and INTEL will use the DDR only for low end value PC's
as the price of rambus 128's is now within $35 of DDR

thought people would be interested in this
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[ksoth]

Sounds interesting to me, but it does seem a little bit overkill, no? I mean, sure it's good technology but when it comes out it will probably be extremely expensibe, like how RDRAM was when it first appeared. I mean, 12.8 GB/s bandwith? That's insane. How much bandwith can a P4 Northwood even use? Obviously the P4 right now doesn't benefit much from RDRAMs superiror bandwith over SDRAM and DDR SDRAM. Unless the reason why P4 doesn't perform well is because memory bandwith of RDRAM isn't good enough to keep up with P4. Which one is it?

"We put the <i>fun</i> back into fundamentalist dogma!"

 

[Guest]

HI,
yes 12 GPS is alot of bandwidth..
the P4 benefits from rdram trmendously though..

sdram can only do around 800 Mps, around the same as teh P3
bus,
rdram was incorrectly tested with a P3 CPU,
so people said rdram was the same or slower than SDRAM.
when in fact the P3 memory bus could not deliver enought performance to rdram to see advantages.

the P4 has a 3.2 GPS memory bus the same as rdram dual channel,
so you can see a full 3 fold increase..

SANDRA's memory throughput test shows SDRAM
at 550 MPS , DDR at 700, and RAMBUS at 1600 !!!!

clearly you have to have a CPU fast enough to saturate rambus,..

there is no bottleneck now with P4..

the 4x rambus will be good for servers where you have 2-4 P4's each at 3.2 GPS ))

can you imagine, well its comming with 870+ chipsets

serious crushing power )

best
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Ultra High Performance Computers-

 

[ksoth]

Well then, seems like 4X Rambus is pretty pointless for single processor systems. Well, maybe not pointless but definately overkill. Here's something though that makes AMD special over Intel. On Intel multiprocessing systems, both processors share the same path to the memory. But on AMD multiprocessor systems, each processor has it's own dedicated pathway to the memory system, therefore keeping the bandwith the same to both chips as if there was only 1 chip there. Pretty nifty.

To me, either Rambus or P4 sucks. Because, obviously Rambus has huge bandwith compared to SDRAM, but a P4 doesn't seem to benefit from it too much, as performance for a P4 Rambus sytem isn't too much better than that of an Athlon DDR system in most applications. That will probably change with the Northwood, but how much is anyones guess. I'd just like to see the P4 DDR chipsets to come out to see what type of performance advantage/disadvantage P4 really has with RDRAM.

"We put the <i>fun</i> back into fundamentalist dogma!"

 

[Kelledin]

Quad signaling gets four times the bandwidth? RDRAM in its current packaging is already double-pumped.

As for Athlon SMP vs. Intel SMP, I'm in agreement; the GTL+ bus just doesn't scale well beyond two CPU's. That's one reason why SPARCs and Alphas still take the biscuit for tightly coupled multiprocessor systems. Perhaps ServerWorks could do something about that...

...or perhaps the i870 will use a different bus architecture. It would be a waste of bandwidth to stick QRsicl (that's what the technology was originally called btw; Rambus had a press release about it on their web page many, many months ago) on something like the i850.



Kelledin
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[Guest]

a few interesting facts..
AMD has no commercial SMP shipping system,
they have demo's and very expensive one off's

AMD's commercial system will NOT have dual memory paths too expensive.. and not necessary since you can have double data signal ram and 2 channels like rambus anyway..
alternates them so makes dual memory paths less advantageous..

the P4 benefits from rambus and bandwidth tremdously
its just that people do not test it right or throow enough heavy IO for it to show.

as I said the P4 outperforms the P3 and Athlon 3 fold on memory and bus throughput..

on FP with proper P4 compiles and dd3d 8a it is 50% faster

you cannot test the P4's 3.2 GPS on notepad or office or
simple looped benchmarks,
you have to do compiling, editing, 3d graphics, memory intensive apps, multitasking, Multimedia ,etc
to show the differences..

I can tell you it is very much faster than P3...
and if you run windows 2000 or ME you gain another 20 %
speed gain..
windows XP in 3 months will give another 25%
the capability is there, software, has to catch up,
that is how advanced and fast it really is

not too many things can bog it down
I have build and tested at least 50 of each for clients
and there is a difference,
don't believe what rumors you hear..
most are from people who reviewed 1 early P4 with the wrong software for like a single day.

best
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[lemming]

Amazing,

Just tell me one thing, How many companies did Rambus have to steal technology from, and sue to do this?

I guess Intel and Rambus deserve each other, when they see something they want, they just take it, and then claim they invented it.



Jump, Jump Now!!

 

[Guest]

I think you have it backwards,

RAMBUS developed these technologies and patents,
for 15 years, I remember seeing a demo of it at comdex in 90

they have over 100 patents,

they are defending their patent, the other foriegn
companies are STEALING it..

it is Ironic that Micron and Hyndai and on the same side, when Micron sued them a few years back along with TI for stealing memory patents.

the Korean's are nortorious for patent infringement,
SAMSUNG expecially until they lost a few

rambus will prevail because they are in the right
the small guy against the giants
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