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RDRAM - PC800-45 vs. PC800-40

by byu1980 / August 19, 2006 1:15 PM PDT

My PC is not an off-the-shelf or major brand ordered item. It was assembled from chosen components, except for the memory and floppy disk drive. The motherboard is an Intel D850MVSE, with 2x256MB (512MB) PC800-45 non-ECC RDRAM. I don't know why the assembler chose non-ECC vs. ECC--I wasn't given the option.

I'm looking at increasing the memory to 1GB (D850MVSE can take up to 2GB in two banks of two slots each, and can use either ECC or non-ECC). If I do, I may end up with 2x512MB of either ECC or non-ECC, then try to sell the non-ECC I have.

I've had at least two online memory configurators scan my system, and they both limit their choices to PC800-45 memory. Neither offered PC800-40 as an alternative. I don't know if that's because I have PC800-45 installed, or because PC800-40 isn't supposed to be used with this motherboard. It seems that the "45" and "40" are latency specifications, and generally PC800-40 is more expensive.

How do PC800-45 and PC800-40 RDRAM (otherwise identical in speed and size) differ, and can I use PC800-40 in the Intel D850MVSE? I don't believe the OS, etc. is pertinent, but I'm using Windows 2000 Pro SP4, with all updates through a week ago.

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too expensive to upgrade, IMO
by linkit / August 19, 2006 3:39 PM PDT

That's speed: 45ns and 40ns (nanoseconds) You could use either speed in that motherboard.

PC800 never really caught on, so it is VERY EXPENSIVE today. You could purchase a COMPLETE NEW SYSTEM from Dell for the price of 512MB PC800 RAM.


I'd keep the computer ''as is'' and use it for less intensive work and purchase a new system for the price of the RAM upgrade.

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Perhaps, but consider this:
by byu1980 / August 19, 2006 7:56 PM PDT

I realize online retailers want around $400 for 1GB and $200 for 512MB of this memory--I've looked at this thoroughly. I don't have the funds for a new system, even though they have come down in price and are faster and more current than mine. Suppose I could buy used memory for half of these prices (or less). That might get me by a couple more years and solve some low available memory problems I'm having now. I'm looking at some used memory now, and with luck will be able to seure the lower prices. That's why I needed to know if PC800-40 was OK. My research sort of tells me that it is (I'm not an IT guy, but am pretty capable inside the PC), and I appreciate the confirmation.

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makes sense
by linkit / August 19, 2006 8:10 PM PDT

I just hate throwing money into much older computers, but I will do that if a good deal comes along. Once I get a price on the upgrades, I would compare that to some of the new USD$200-300 systems out there. Good luck!

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perhaps, but consider this
by ramarc / August 20, 2006 1:39 AM PDT

$400 for 1GB or
less than $300 for
$96 for intel d946gz motherboard
$91 for intel pentium d 805 (2.8ghz dual core)
$91 for kingston 1gb ddr2-667 ram

the new motherboard supports the new core 2 cpus and pci-express so you'd be upgrade ready. the cpu is much faster than what you've got now. and everything is new and warranteed.

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(NT) (NT) Probably need a new 24 pin PSU too..
by VAPCMD / August 21, 2006 2:15 PM PDT
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by Hammerhead1 / September 3, 2006 7:01 AM PDT



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eBay was always on my mind
by byu1980 / September 4, 2006 2:57 AM PDT
In reply to: CHECK OUT EBAY !

I had been watching PC800 auctions on eBay for at least a week before I asked the first question in this forum. That's where I noticed both the PC800-40 and PC800-45 being offered, and wanted to know if I could use PC800-40 in a motherboard designed for PC800-45. I've since bought 1GB of PC800 RDRAM on eBay for about $130, including shipping. Thanks for your suggestion.

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