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SDRAM->RDRAM adapters

K

kronchev

[H]F Junkie
Joined
Feb 23, 2001
Messages
12,051
ive seen them before...I may be getting an RDRAM burdoned board soon, and since its hard to find good RDRAM (might win some on ebay for cheap however) how well do these adapters work? id have to pick one up if its any good, would be cheaper than new RDRAM
 
If my failing memory serves me correctly, Intel used the converters on early RDRAM boards. I think it was discovered that there was a fatal flaw and Intel had to recall almost a million of them. I don't remember if there ever was a fix though.

So, long story short, SDRAM->RDRAM converters = Teh Lose


Riley
 
it should be okay to use them on i820 boards.. i wouldnt recommend them on i850's though. I have a 2xPIII700 i820 HP Kayak workstation, and it's using the converter for 4 years.. no problem so far.
 
Originally posted by kronchev
skud: thats a new one, but i still like oh noes

fanz: i think its on a 820, ill check with the guy
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Not to be rude, but its a waste of time going for SDRAM on that board.

It performed better with RDRAM, although it still couldn't beat even an Apollo 133A-based board... RDRAM just wasn't well mated to the PIII's bus. :(
 
Originally posted by Josh_B
Not to be rude, but its a waste of time going for SDRAM on that board.

It performed better with RDRAM, although it still couldn't beat even an Apollo 133A-based board... RDRAM just wasn't well mated to the PIII's bus. :(
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P3's are sensative to latency- symmetrically clocked SDRAM at Cas 2.0 provided the best performance. They aren't like the P4's, but are more like Athlons in that they don't need excessive amounts of bandwidth.

This means that when you try to use Rambus on a P3, you give it more bandwidth than it will ever use while penalizing it with latency. Intel did it so that RDRAM would be out there for the P4, not because it was faster. (lots of marketing and other stuff in there too).
 
I thought it was discovered that irregardless of board or chipset, the adapters didn't work properly because the chipsets were specifically designed with RDRAM in mind, or else we would've seen i820 and i850 boards with SDRAM slots right on the board.
 
Originally posted by MrMike
I thought it was discovered that irregardless of board or chipset, the adapters didn't work properly because the chipsets were specifically designed with RDRAM in mind, or else we would've seen i820 and i850 boards with SDRAM slots right on the board.
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Yes.

The MTH (Memory Translator Hub) implementation Intel had created was buggy, and often caused lockups and other symptoms.

Also, considering RDRAM uses a serial, packetized protocol, and SDRAM uses a parallel protocol, adapting the signals led to crazy latency and poor bandwidth.

Stick with RDRAM IMO.
 
its an 850 chipset, I just looked at the specs. guess the MTH's arent worth getting if theyll fuck up the stability, esp since its going to be my personal server when I get it. I know that it was headed for slowness even if they worked perfectly, but I cannot afford RDRAM at this time, at all. I need maybe 256 of it but that stuff is EXPENSIVE. not to mention I dont even have a proc yet (thinking 2.0 celey).
 
Originally posted by kronchev
its an 850 chipset, I just looked at the specs. guess the MTH's arent worth getting if theyll fuck up the stability, esp since its going to be my personal server when I get it. I know that it was headed for slowness even if they worked perfectly, but I cannot afford RDRAM at this time, at all. I need maybe 256 of it but that stuff is EXPENSIVE. not to mention I dont even have a proc yet (thinking 2.0 celey).
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You know, it may actually be cheaper to get yourself an i845-based board, and some DDR, than have to buy expensive RDRAM. Additionally, the RDRAM sticks won't be as dense, and you may have difficulty finding what you need.
 
RDRAM is nice if you get an 850 based board and some PC800 or PC1066 memory. The only problem is that the RDRAM itself is costly. 1066 is a solid performer though.
 
I'm still using 1GB of PC800 with a 2.66B (went from 1.6A to 2.0A to 2.4B then 2.66B- parents own a store so i get the faster processors from time to time) processor on a Intel made board.. no problems at all, and for now: i'm satisfied with it.


Originally posted by Sir-Fragalot
RDRAM is nice if you get an 850 based board and some PC800 or PC1066 memory. The only problem is that the RDRAM itself is costly. 1066 is a solid performer though.
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when they [PC1066] work right you mean :p, besides: those are pretty rare, they were made at the end of "Rambus-Intel contract" days, so most were just remarked PC800's..*cough, OCZ.
 
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