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RIMM info

L

lelliott731

[H]ard DCOTM April 2017
Joined
Mar 15, 2002
Messages
941
I just inherited a Dual Slot 1 Dell OptiPlex. It happens to run the Intel 820 chipset, which unfortunately, uses Rambus. I am getting a pair of 1GHz/133MHz processors, and I was wondering which Rambus memory would be best. There seems to be four kinds:
PC600
PC800
PC1066 16-bit
PC1066 32-bit

And I was wondering which of these operates at 133MHz FSB that my processors are going to run at, and if they don't run like that, if there is some weird Rambus thing about the speed, then which is the best for my machine, or best for cost. The 1066 stuff, whether 16 or 32 bit seems to be about two to three times more expensive then the other PC600 & PC800 memory. Any help would be greatly appreciated!
 
Are you sure that's what type of memory it takes? My grandfather's Gateway takes RDRAM, I put in PC600, which runs at 600mhz. But, it's a 1.8ghz. 133mhz would PC133 I thought. My old dual 800mhz servers at work take registered ECC PC133. I could be wrong though...
 
Originally posted by lelliott731
I just inherited a Dual Slot 1 Dell OptiPlex. It happens to run the Intel 820 chipset, which unfortunately, uses Rambus. I am getting a pair of 1GHz/133MHz processors, and I was wondering which Rambus memory would be best. There seems to be four kinds:
PC600
PC800
PC1066 16-bit
PC1066 32-bit

And I was wondering which of these operates at 133MHz FSB that my processors are going to run at, and if they don't run like that, if there is some weird Rambus thing about the speed, then which is the best for my machine, or best for cost. The 1066 stuff, whether 16 or 32 bit seems to be about two to three times more expensive then the other PC600 & PC800 memory. Any help would be greatly appreciated!
Click to expand...

pc1066 was just two sticks of pc800 on one stick. just buy the pc800
 
I thought that PC1066 was faster then PC800? Just like PC800 is faster then PC600. If PC1066 is just two PC800 sticks put together, why does it operate faster?
 
Chances are it uses the Intel VC820 mobo. It supports up to 512mb in two slots. You need two 256mb RIMMs.

You can use PC600 or PC800.

PC 600 will run the bus/mem ration at 4.5, PC800 will have the bus/mem ration at 6.

Tests have concluded that there isn't much of a difference between the performance of the two. If PC600 is significantly cheaper, go ahead, if not, get the PC800.
 
What do you mean by "with a ratio of 6", do you mean 1/6, 4/6, or something else?
 
Oh yeah, and how big of a difference would there be between PC800 45ns, and PC800 40ns? And would PC600 40ns be the same speed or close to as PC800 45ns?
 
Kind of. The chip has a 133Mhz bus so it has to be ratio'd to a point to meet the 600 or 800Mhz spec of the memory.

On the Pentium 3s it was rather pointless because the bottleneck is pretty much in the bus speed, hence why if you look at a Pentium 4 and compare the PC133, PC800 and DDR models, the PC800 (RIMM) and DDR ones will whoop on the PC133 models.

Personally, I would just get the PC800 stuff. There isn't much of a price difference anyway.

They also made PC700 for your reference.
 
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