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DDR PC3200 will or wont work on pc2700 compatable

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September 22, 2002 1:37:22 PM

motherboard? I dont want to assume the purchase of faster DDR ram will be backwards compatable so I am asking. In other words if I purchase pc32 ram for a motherboard that says it supports pc2700 ram like the Asus P4S8X will the faster ram work at the pc2700 speed or not work at all?

Balls, said the Queen if I had them I would be king!
September 22, 2002 1:49:58 PM

unbelievable that I asked the same question at the same time =).
September 22, 2002 1:56:13 PM

Maybe we will get the answer twice as fast! :-)

Balls, said the Queen if I had them I would be king!
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September 22, 2002 2:17:58 PM

Sorry for saying this but asking the same question twice wont make anybody answer it faster. It you want quick answers, read the FAQ!
September 22, 2002 2:19:33 PM

so there smarty pants!

Balls, said the Queen if I had them I would be king!
September 22, 2002 5:06:05 PM

Quote:
I didnt "we" just happened to by chance...

Yes, what a coinsidence that neither of you read the FAQ. But anyway DDR RAM is backwards compatible.
a b } Memory
a b V Motherboard
September 22, 2002 6:15:21 PM

Hobbit, I thought you were a computer guy? You remember PC133 operated at PC100 and PC66 speeds? You remember that memory speed rating is a max garunteed speed, you can always go slower than the max? You can run PC3200 at PC2700, PC2100, PC1600, or any speed in between.

<font color=blue>You're posting in a forum with class. It may be third class, but it's still class!</font color=blue>
September 22, 2002 7:02:26 PM

Umm, in my experience PC133 doesnt work in PC66 systems. Yes, I know a lot but have not kept up with the new Ram specs so need to ask like everyone else the first time.

Balls, said the Queen if I had them I would be king!
a b } Memory
a b V Motherboard
September 22, 2002 7:18:11 PM

My experience says different. Completely different. You see, most technicians make the <b>STUPID</b> mistake of thinking it's a SPEED problem, when it's actually a DENSITY problem. The VX chipset for instance could only handle chips of a density of 2MB/chip. That means a 16-chip module only supported at 32MB. On the other hand, the TX chipset had the same limitations as the BX, 16MB/chip, so that a 16-chip module supported 256MB.

Now, on the TX chipset you could use PC66, PC100, PC133, etc. Even overclocking chips (PC150/PC166). But there were no PC133 chips of a low enough density to be read at full size with the VX chipset.

So it was never a speed issue, it was always a density issue.

I can run the bus speed of my Abit board as low as 50MHz with PC133 modules, no problem.

<font color=blue>You're posting in a forum with class. It may be third class, but it's still class!</font color=blue>
September 22, 2002 10:47:39 PM

so knowing that isnt necessary for my livelyhood but thanks for the info. :-)

Balls, said the Queen if I had them I would be king!
September 23, 2002 2:37:42 AM

I use my 512mb PC3200 at PC2700 speeds all the time. In fact, using high quality PC3200 means that i can use extreemly hard memory timings at 166mhz without any problems.
(excess headroom is allways nice)

<b><font color=blue>I prefer to blend into the background, because it's much easier to sneak up on people and disembowel them that way. Arr!</b></font color=blue>
September 24, 2002 11:35:45 PM

If i get the Asus P4S8X mobo and a stick of (corsair 512 ddr3200) will I be able to run it at the 3200 speed or will it reduced to 2700 speeds? Thanks for any help.
September 25, 2002 1:01:22 AM

Sounds like the motherboard only supports 166mhz FSB.

So you'd be limited "officially" at 166mhz, or PC2700.

Now, if you manage to OVERCLOCK that mainboard to 200mhz FSB, then you'd be in business.


That's like my Gigabyte 7vaxp. They pulled 3200 support before it shipped, 'cause it can handle only one dimm of it. So if I ever slap on another dimm, I *have* to drop down below 200mhz. Probably, depending on where the divider kicks in, to 166mhz. Either that, or I have to do some good cooling on the northbridge. I usually pull off the stock heatsink and put some arctic silver epoxy on it instead of the silicone stuff.

But, thank god I have other people in my family to whom "hand-me-downs" can go... =)

P4's @ 3600Mhz ()wNz J00 4LL!!!!!!
September 25, 2002 9:56:32 AM

what kind of cooling do i need to oc it to 200?
September 25, 2002 9:07:11 PM

Quote:
see, most technicians make the STUPID mistake of thinking it's a SPEED problem, when it's actually a DENSITY problem.

maybe thats why 64mb PC133 ram wouldnt work on my sis' computer (which supported PC66 ram...even though this was years ago)...thanks for the heads up <b>Crashman</b>...

:eek:  <b>L <font color=red>A</font color=red> e <font color=red>T</font color=red> a <font color=red>I</font color=red> K</b> :eek: 
September 25, 2002 9:11:31 PM

Quote:
If i get the Asus P4S8X mobo and a stick of (corsair 512 ddr3200) will I be able to run it at the 3200 speed or will it reduced to 2700 speeds? Thanks for any help.

the P4S8X supports ddr400 (pc3200) memory unofficially, so if ddr400 ram doesnt work on your system...you cant blame asus for it....anyways...
you will be able to potentially run pc3200 ram on the board by setting the CPU:MEM ratio to 4:6 (FSB >= 133) or 3:6 (FSB < 133) in the BIOS...but its not guranteed to work...so its pretty much hit or miss...if you cant run pc3200 memory...you can always clock your memory down to ddr333...

:eek:  <b>L <font color=red>A</font color=red> e <font color=red>T</font color=red> a <font color=red>I</font color=red> K</b> :eek: 
a b } Memory
a b V Motherboard
September 25, 2002 10:27:05 PM

Yes, I've bought a lot of PC100 that was relabled as PC66 and PC133 that was relabled PC100 because of this "problem". In fact, I have 12ns SDRAM chips (obviously PC66) that are too high density for the VX chipset. And I once bought a PC133 module that had too high density for even the i815 chipset, to which the "tech" who sold them to me said "must be your board isn't PC133 compatable". Almost blow a cork over that one.

<font color=blue>You're posting in a forum with class. It may be third class, but it's still class!</font color=blue>
September 26, 2002 6:53:42 PM

Yeah. My old Celeron 500 system is running two low-density PC133 DIMMs at PC66 speed that work quite nicely. It's just a matter of research before hand to figure out what your system can support and make sure you get just the right hardware. :)  (Like how I ended up with a 128MB of EDO on my Pentium 133 box.)

It's kind of sad, really. I feel like so much potential is being wasted using memory that's rated to be twice as fast as what I'm running it at, but the PC133 was cheaper than buying PC66 at the time. (If that makes any sense.)

But then I remember how many other deranged things I've done to that system and I start to feel bad for that old box. Maybe it's suffered enough already.

<pre><A HREF="http://www.nuklearpower.com/comic/186.htm" target="_new"><font color=red>It's all relative...</font color=red></A></pre><p>
a b } Memory
a b V Motherboard
September 26, 2002 8:53:24 PM

When the market got flooded with PC133, the price dropped. Old crappy PC66 was no longer in production. People started relabling low density PC133 as PC100 and even PC66 because customers complained that their system "didn't support PC133".

<font color=blue>You're posting in a forum with class. It may be third class, but it's still class!</font color=blue>
September 26, 2002 9:05:11 PM

Quote:
When the market got flooded with PC133, the price dropped. Old crappy PC66 was no longer in production. People started relabling low density PC133 as PC100 and even PC66 because customers complained that their system "didn't support PC133".

Heh heh heh. That's funny, but it makes a strange sort of sense. Like downbinning CPUs I guess... I suppose that explains why I see a lot of PC100/PC133 on Pricewatch. Too many not-so-educated people wondering how to upgrade their 100MHz FSB systems I guess...

I was kind of disappointed though. :(  I had hoped that with PC133 instead of PC66 I could at least set my RAM timings to better settings or something. Turns out, neither my mobo nor BIOS even have memory timings. **sigh** Oh well.

Still, at least I know my RAM is never being pushed to it's limits. It should last a long time being run so conservatively. :) 

<pre><A HREF="http://www.nuklearpower.com/comic/186.htm" target="_new"><font color=red>It's all relative...</font color=red></A></pre><p>
September 27, 2002 1:15:43 AM

PC100 is now more expensive than PC133 in australia!

allthough ive noticed that top of the line DELL systems still insist of using <b>PC100</b> with their pentium 4's
<b>*SHUDDER*</b>

<b>I am an Emotional and Intellectual Strumpet! :cool: </b>
September 27, 2002 3:33:22 PM

Quote:
allthough ive noticed that top of the line DELL systems still insist of using <b>PC100</b> with their pentium 4's
<b>*SHUDDER*</b>

Whoa! Can you provide a link? I'd love to see that! (and laugh for hours on end)

<pre><A HREF="http://www.nuklearpower.com/comic/186.htm" target="_new"><font color=red>It's all relative...</font color=red></A></pre><p>
September 28, 2002 4:04:46 AM

Unfortunately no, it was a glossy flyer that was jammed into the middle of a very popular auzzie newspaper... and the paper went somewhere :( 
from memory the system specs were

P4 1.8 (256mb cache) didnt say wether it was a socket 423 or 478 but u know which one im puttin my money on lol
256mb SDRAM PC100
Intel integrated mobo, Vido and possibly sound (cant remember exactly) 8 to 64mb reserved for video *more shudders*
20 or 30Gb HDD
40x cdrom
15" dell monitor

doesnt that just make u salivate at the mouth?

what got me was the cost, allmost 2 grand australian. i could build an AMD OR p3 system that would rape its buttocks for 500 cheaper!

<b>I am an Emotional and Intellectual Strumpet! :cool: </b>
!