what is the ram with PCxxx stand for?

[faye]

Hi, i see some ram with PC3500, PC2700 ... what is it?
is it the speed of ram for DDR?

i have sdram, it is PC133... is it like PC2700 vs. PC133 speed?

 

[Goi]

Its a way to name different types of memory at different speeds. Basically there are 3 widely accepted ways, one for SDR-SDRAM, one for DDR-SDRAM and another for RDRAM.
SDR-SDRAM terminology is the one you're familiar with. There's the JEDEC approved PC66, PC100, and PC133 and the other unofficial PC150 and PC166 types. The numbers are the PC stand for the speed of the memory bus in MHz.
DDR-SDRAM used to be named the same way as SDR-SDRAM, except the numbers are doubled to indicate the doubling of data transfers per clock cycle and the theoretical doubling of performance. Hence you used to have PC200 and PC266 DDR-SDRAM. Before long however, they changed the naming to PC1600, PC2100 and recently PC2700. The numbers after the PC in these cases represent the memory bandwidth, in MB/s. The reason they used this was to market themselves favorably against RDRAM, which typically had a higher PC rating.
RDRAM is named the same method as SDR-SDRAM and early DDR-SDRAM, in that it is rated at double its memory clockspeed(due to it being DDR too), in MHz. Thus you have PC600 and PC800, and recently PC1066 with memory bus speeds of 300, 400 and 533MHz respectively.

 

[faye]

is it the RDRAM u say the Rambus?

what is rambus? faster or slower than pc2700?

how much faster is PC2700 compare with PC133

 

[Goi]

yes, RDRAM is RAMBUS. RAMBUS is typically faster than comparably specified DDR-SDRAM, because it simply has more bandwidth than DDR-SDRAM can currently provide. DDR2 will hopefully change this aspect. However, the downside is tha RDRAM is often much more expensive than DDR-SDRAM. In fact, it can be up to twice DDR-SDRAM's price, depending on speed.
PC2700 is theoretically 2.5X faster than PC133. PC2700 provides a 2.7GB/s bandwidth, whereas PC133 only provides 1.06GB/s bandwidth. Real world differences are much less however, unless you're performing memory intensive benchmarks or apps.

 

[faye]

which one is newer?
ddr or rdram?

which one can last longer, i mean future use
like pc133 is already eliminated because of the new motherboard and cpu

 

[Goi]

Well, DDR has more applications. Its used for graphics cards, and systems running on both AMD and intel platforms. RDRAM is only widely used for intel P4 systems. In fact, intel has committed itself to phasing out RDRAM in favor of DDR-SDRAM, even in high end server systems. So, in theory, DDR-SDRAM would last longer and have more applications. Take note however, that in 1-2 years time DDR2 should hit the market, and AFAIK DDR2 isn't backward compatible with existing DDR-SDRAM.

 

[mooseAndSquirrel]

Hey Goi - nice answers politely and patiently given.

 

[Goi]

Thanks, its my pleasure. I try to help whenever I can, since I know how frustrating it is when I have a question/problem that I can't solve. I always hit the AT forums when I get them

 

[kevin oliverio]

Where can i found more information about this, I mean a book or something like that

 

[UsandThem]

Where can i found more information about this, I mean a book or something like that

One of best places for getting answers is to create a post of your own, and not reply to threads that were last active in 2002.........17 years ago.

A good place to start is on Wikipedia

 

[kevin oliverio]

Thanks for answering, sorry about that i did't realize that it was a thread in 200**, .
I found that it stands for peak transfer rate in a memory. information found here..
Meaning of PCXX

 

[Arkaign]

The last post in this thread before the epic necro was only one week after the release of the original Kingdom Hearts

And two months before Ratchet and Clank and Metal Gear Solid 2!!!