Pentium 4 SiS 645 beats i850...

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Originally posted by FaTs:
PC600 is higher latency than PC800 isn't it ?

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That's correct. Also, the number of physical channels and banks has an effect on latencies. In fact, it's possible that if trace lengths are long enough, or if there's enough loaded (filled) banks, PC800 might have higher latencies then PC600 on simpler (lower bank count etc.) platforms. This is because of artificial delays introduced to compensate for different delays. Of course, PC800s raw-bandwidth would generally more then make up for the latnecy difference.

Because of the way the DRDRAM memory controller accesses the mapped memory, the memory controller must introduce delays so that all modules have the same latency. I'm not quite sure about this, but I believe the RDRAM controller doesn't use a conventional strobe on a conventional demultiplexer (decoder) like SDRAM controllers. That point is really not important in answering your question, however.

More specifically, since slower speed RDRAM runs on a slower dedicated clock, any signal latencies (propogation delays, etc.) would be amplified and would have to be accordingly compensated for. The exact algorithim for this I'm not sure of, but it is part of Rambus' tight reference specifications for the DRDRAM platform I'm sure.

As always, hope the helps. It's very late here and incoherency is beginning to set in, forgive me for that. https://www.sharkyforums.com/images/.../2005/06/5.gif

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Count Baron of the OC Crusaders

[This message has been edited by bobgod007 (edited October 09, 2001).]

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Originally posted by elimc:
One thing I noticed was that I am not able to buy a DDR SDRAM mobo for the P4 and I am not able to buy a DDR333 memory stick for any mobo, so being excited about the DDR board beating the RDRAM board is premature in this case. If we used future technologies from Rambus they would mop the floor with the DDR SDRAM mobos.

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that has got to be one of the worst posts i have ever seen. who cares you cannot buy it? that is the point of the review, to test stuff that isn't out yet. duh!! see how much hoopla there was over the nForce, people were talking as if it was the second coming. too bad it kinda dissapointed though, anyways, my point is you get excited over things that are not available yet, not things you can readily get.

My post was in reply to the first poster. I was just reminding him that the mobo that they tested wont be released to the public for awhile. If we want to compare future technologies, then I'm sure Rambus would be able to provide technology that would destroy DDR SDRAM in the benchmarks. PC1200 at 64 bits anyone? But they didn't ask Rambus if they wanted to provide silicon. This review is just marketing hype.

BTW, did you see the review of PC96000 vs cold fusion vs magical rocket shoes at Annandtech? I can't wait! (Sarcasm)


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You can measure the greatness of any CPU component by running "QuakeIII" benchmarks

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Originally posted by elimc:
My post was in reply to the first poster. I was just reminding him that the mobo that they tested wont be released to the public for awhile. If we want to compare future technologies, then I'm sure Rambus would be able to provide technology that would destroy DDR SDRAM in the benchmarks. PC1200 at 64 bits anyone? But they didn't ask Rambus if they wanted to provide silicon. This review is just marketing hype.

BTW, did you see the review of PC96000 vs cold fusion vs magical rocket shoes at Annandtech? I can't wait! (Sarcasm)

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The chipset is complete. It is in the hands of board manufacturers now, and the expected release date is supposed to be the next 30-45 days...not that long.

The PC2700 spec has already been ratified by JEDEC, and both Kingmax and Corsair having working modules...that's what they used in the review.



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Earl for the OC Crusaders

P3 700@1001 (143x7.0 1.85V)
Abit VH6-II w/256MB PC150 (2-2-2)
Radeon 64MB VIVO 200/200
SBLive! Value
13.5GB & 30GB Maxtor ATA100 (5400RPM)
Memorex 36X CD-ROM/TDK 8x4x32 CD-RW

OK, I give up. I was just saying that you can't buy the boards now. Just like you can't buy PC1066 boards at 32 bits although the boards do exist and are being worked on. I mean, the first DDR boards were like 8 months late an they are just starting to get good benchmarks with the DDR boards.

Also, can you buy PC2700 right now? Just curious. How much does it cost?


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You can measure the greatness of any CPU component by running "QuakeIII" benchmarks

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Originally posted by elimc:
OK, I give up. I was just saying that you can't buy the boards now. Just like you can't buy PC1066 boards at 32 bits although the boards do exist and are being worked on. I mean, the first DDR boards were like 8 months late an they are just starting to get good benchmarks with the DDR boards.

Also, can you buy PC2700 right now? Just curious. How much does it cost?

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DDR333 is defintely being used since companies are already making their DDR333 boards such as Iwill. You cannot straight up buy it from anywhere that I know of, but Crucial's PC2100 can do 2700 (166 Mhz Bus) fine (which means it is OBVIOUSLY easy to make).

Whereas we have never seen any information pertaining to the performance or specs of PC1066 @ 32 bits bus as you claim.

PC1066 is much farther off than DDR333 obviously.

Check my previous post above https://www.sharkyforums.com/images/.../2005/08/2.gif

I am not saying that PC1066 is bad, I think it will be very good, but this isn't about PC1066 RDRAM and PC2700 DDR next year - it's about PC2100 and PC 2700 right now against what is current.

Even if PC2700 isn't released for a few months, the DDR266 (PC2100) scores were just barely below those of the DDR333 and RDRAM. I'd still go for the DDR most likely because the difference in motherboard and ram prices could save me anywhere from $100-200 which I can spend on more important things, not just stuff to make my Sysmark scores higher.

Radeon 8500 anyone?

You make a convincing argument, but there are a few things to point out.

PC2700 is not that hard to make and never was. The problem is with the memory controller chips. With speeds of DDR increasing it becomes increasingly complex to design the mobos. This is why we don't see DDR ramping up in speed faster.

Why haven't you heard of 1066 32 bit RDRAMs? I think the reason is marketing hype. Rambus is not sampling their silicon to websites whereas Via and other companies are. Does this mean that they don't have it? No, it's just that people like Tom and Annand haven't gotten a hold of it.

The Rambus roadmap is pretty specific, whereas DDR SDRAM has a foggy future. Here's a good link:
http://developer.intel.com/technolog...ng_IDF2001.pdf

Obviously, they have these products in the lab. This roadmap shows PC1600 (Samsung) in the year 2003. DDR SDRAM will move to 400MHz by 2003 (Samsung) .In addition, RIMMs will move to 64 bit by the year 2005. PC1066, PC1200, and QRSL were all demonstrated in the year 2000. And we haven't even seen what "Yellowstone" is.
http://www.rambus.com/developer/down...hnology_V7.pdf

If you want to compare future technologies, then go ahead. IMO RDRAM would be much faster than future DDR SDRAM solutions. BTW, there is a PC1066 board at Aces hardware. It gave a large performance gain and actually shows lower latency than SDRAM. Also, remember that when PC2700 officially comes out, we will probably have 4 layer PC boards using 4iRDRAM. This will lower price considerably for an RDRAM solution, after all, we are comparing the future.


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You can measure the greatness of any CPU component by running "QuakeIII" benchmarks

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Originally posted by Duo:
Very nice. Maybe this well start to lower the prices. Coz I am thinking of making the jump to intel.

Duo

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what set up for the p4 are you looking at. Im been looking at the abit th7-11. But not sure yet. Still reading and looking . whats your thought on a board.
Im looking to buy in about 2 weeks. Almost ran out to the show on a whim on sunday. But who nows what I whould of bought. lol I feel the need for a full upgrade....


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Main system

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• ichy scratchy tv tunner
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• netgear nic and 8 port hub
• and other misc. stuff

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(snip)
Also, can you buy PC2700 right now? Just curious. How much does it cost?
[/B]

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House Brand 256MB PC2700 (OVERCLOCKING) 266MHZ CL2.5 7.5ns DDRAM Price for PHONE ORDER PRICE, mention Price Watch - 256MB PC2700 (PC2100) CL2.5 7.5ns DDRAM $ 65 FROM 6.86+ 10/9/2001 7:01:07 PM CST Atacom, Inc.
877-428-2266
510-226-9596
Online Ordering CA -


Yeah I know it's not "real" 6ns pc2700, but it'll do the job.

RDRAM isn't all that impressive (though it has improved) when you compare the ability of one RDRAM RIMM to a DDRSDRAM DIMM. A 400MHzFSB feeding a dual memory channel IS impressive and would be even better with DDR.


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My system's specs dejour
My benchmarks, mods, and system pics.
SGC Lite Member, S(Ultra)HRC
My high score in that Game by MadOnion

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The Rambus roadmap is pretty specific, whereas DDR SDRAM has a foggy future. Here's a good link: http://developer.intel.com/technolog...ng_IDF2001.pdf

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Well that was quite a lot to read. But if the projections have held up 1066 could launch with the next P4 in about a month. And I do like to see all those projections of falling RDRAM prices.

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Main system <A HREF="http://communities.msn.com/ThermosPlace/shoebox.msnw?Page=Last
Dual" TARGET=_blank>http://communities.msn.com/ThermosPlace/shoebox.msnw?Page=Last
Dual</A> 1.7 Xeons
860 chip set
512Mb PC800ECC
nVidia Quadro Pro 64Mb
Dual 20gig HD's
Sound Blaster 512V
12x/8x/32x CD
W2000sp2

2nd system
<A HREF="http://communities.msn.com/ThermosPlace/933.msnw?Page=Last" TARGET=_blank> http://communities.msn.com/ThermosPlace/933.msnw?Page=Last[/url]
PIII-933/133
Intel vc820i
256Mb's PC800ECC
8gig HD
VooDoo3 2000
12x8x32 CDR
W98SE

Yes, I thought it was interesting that Samsung predicts that RDRAM will cost about a dollar more to make than DDR SDRAM.

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You can measure the greatness of any CPU component by running "QuakeIII" benchmarks