Rdram(pc800) runs at 400Mhz?

[Jincuteguy]

What's your rdram speed? (pc800)
Cause I checked mine using CPU-Z program, and it said 400Mhz, but I thought pc800 suppose to run at 800Mhz???

 

[Budman]

it's actualy 100mhz Quad pumped.

 

[Corporate Thug]

rdram is fo suckas! j/k. good call budman

 

[Jincuteguy]

so they dont run at 800Mhz? only 400Mhz?

 

[AgaBoogaBoo]

I th ink its runs at 800mhz but because of the bit size or something along those lines, it basically has to work twice as fast to achieve the same speed as compared to DDR RAM. So basically, DDR RAM running 800mhz theoretically is twice as fast as RDRAM PC800, but since there is no DDR800, and we are at DDR400 for the most part, it gives the same amount of speed as PC800 at a lower cost.

 

[AgaBoogaBoo]

Originally posted by: Jincuteguy
so they dont run at 800Mhz? only 400Mhz?

Does it matter what speed it runs at? I think the point should be that it provides enough bandwidth for a 400mhz FSB cpu. PC1066 provides enough for a 533mhz FSB cpu and there is PC1200 I believe but its use is very limited.

 

[Jincuteguy]

what im asking is what exactly the total speed of pc800 running at? why only 400? i thought it's 800Mhz
And my cpu fsb is 533 , not 400. so should i changed it to 400 since im using pc800 , not 1066?

 

[Nebor]

I was wondering, since there's now DDR533 available, why don't we have motherboards\processors pushing 1066mhz FSB?

 

[Jincuteguy]

so what exactly is the speed of rdram pc800 running at? anyone?

 

[littleman2]

Each stick of pc800 ram runs at 400, but since rdram is read in pairs that gives you a combined speed of 800 hence the name pc800.

 

[Jincuteguy]

thx man

 

[Jincuteguy]

is it good or better to run pc800 with 400FSB or 533FSB?

 

[Budman]

nm

 

[dexvx]

So many myths in this thread.

PC800 RDRam runs at 400Mhz. It uses DDR technology (hence the lawsuits) to make it an effective 800Mhz (1.6GB/sec). Dual Channel RDRam, found in 840/850 motherboards, double the effective bandwidth, to 3.2GB/sec. PC1066 runs at 533Mhz, DDR. However, since PC1066 was relatively expensive, 533FSB procs were sometimes paired with PC800 RDRam. It doesnt make a difference either way, although PC1066 will give a performance boost.

 

[ElFenix]

jebus!

its 400 MHz double pumped. technically rdram is DDR. so, because back when they were naming it memory went by mhz and not bandwidth, they called it pc800.

 

[Schadenfroh]

question does ddr200 aka 400mhz ram hand a 800mhz fsb, or is that reserved for the faster memory. i heard that intels 800mhz is quad pumped, so if my ddr400 + dual channel ddr = 800mhz fsb on the intel side?

 

[Random Variable]

Originally posted by: ElFenix
jebus!

its 400 MHz double pumped. technically rdram is DDR. so, because back when they were naming it memory went by mhz and not bandwidth, they called it pc800.

I thought that the 800MHz comes from the fact that PC800 is dual-channel.

 

[AgaBoogaBoo]

Originally posted by: Nebor
I was wondering, since there's now DDR533 available, why don't we have motherboards\processors pushing 1066mhz FSB?

Why? Because thats for Prescott to use. Thats like saying we have 20 fans on a small case, why not make something to make heat for them to blow?

 

[JihadJim]

Originally posted by: Vespasian

Originally posted by: ElFenix
jebus!

its 400 MHz double pumped. technically rdram is DDR. so, because back when they were naming it memory went by mhz and not bandwidth, they called it pc800.

I thought that the 800MHz comes from the fact that PC800 is dual-channel.

RDRAM was released before dual channel P4 mobo's were released. I should know because I got stuck with a single channel Intel 820 board w/ 800mhz PIII...cost about 3.5 grand.

 

[Mingon]

Dont forget they were only(originally) using 16bit paths hence the need for dual channels on P4

 

[Rand]

Originally posted by: Vespasian

Originally posted by: ElFenix
jebus!

its 400 MHz double pumped. technically rdram is DDR. so, because back when they were naming it memory went by mhz and not bandwidth, they called it pc800.

I thought that the 800MHz comes from the fact that PC800 is dual-channel.

DRDRAM does not need to be implemented in a DualChannel configuration, there have been SingleChannel DRDRAM supporting memory controllers, most infamously that utilized by the I820 chipset.
Rambus coined it PC800 as a marketing name due to the fact that it operates at 400MHz double pumped, PC800 certainly sounds much better then PC133 which it was competing against when initially launched.
Of course DRAM manufacturers eventually one-ipped them by basing DDR SDRAM's marketing name by peak bandwidth rather then the clockspeed as had formerly been standard.

question does ddr200 aka 400mhz ram hand a 800mhz fsb, or is that reserved for the faster memory. i heard that intels 800mhz is quad pumped, so if my ddr400 + dual channel ddr = 800mhz fsb on the intel side?

The 800MHz FSB operates at 200MHz quad pumped on a 64bit wide bus, providing a peak memory bandwidth of 6.4GB/s.
200MHz DDR SDRAM (PC3200) also operates on a 64bit wide bus, in singlechannel mode providing a peak of 3.2GB/s, there are multiple ways of implementing two DDR channels in tandem but I won't get into that suffice to say that operating in DualChannel mode it would also provide 6.4GB/s of memory bandwidth matching perfectly with the P4's '800'MHz FSB.

 

[dexvx]

Originally posted by: JihadJim

Originally posted by: Vespasian

Originally posted by: ElFenix
jebus!

its 400 MHz double pumped. technically rdram is DDR. so, because back when they were naming it memory went by mhz and not bandwidth, they called it pc800.

I thought that the 800MHz comes from the fact that PC800 is dual-channel.

RDRAM was released before dual channel P4 mobo's were released. I should know because I got stuck with a single channel Intel 820 board w/ 800mhz PIII...cost about 3.5 grand.

I have a 820 based system too, but I bought it after the RDRam craze, and it was chaeper to build than SDRam system. If you plop in a Tualatin in one of those boards, you have a pretty fast system with a 1/2 AGP multiplier.