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Dell 8250 RDRAM problems

3402 Views 8 Replies 3 Participants Last post by  Barry_R
Ive got a big problem. my computer came with 2 sticks of 128mb RDRAM pc 1066(samsung) and I bought 2 sticks of 256mb pc800 ram (samsung) off ebay in hopes of giveing my computer a little more performance, but the bios says its unsupported and completely stops my computer from booting up. ive read in alot of forums that this motherboard should be able to support this ram but it will default both rams to pc800. Is there anything i can do to this computer to get it to use the pc800? Is there a way i can use a different bios mabey?
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Is the ram you bought also RDRAM?

It may be that your motherboard does not like Ram of different sizes and speed. Have you tried to take the old ram out and just try to run with the new stuff you bought?
rdram and sdram as far as i know you cannot mix them the m/b usually supports one or the other
im 100% sure both sticks are RDRAM. i have tryed running it with just the new sticks and it still halts right away when i turn it on and says that the ram is unsupported, and to replace it with pc800 40ns or faster. but the thing is that this ram is pc800 45ns(its writen right on the sticks). from what i can tell, the problem is with the Dell bios. ive checked out a few other forums and people with this same motherboard have no problems mixing different ram speeds. there must be a way to bypass the dell bios, or at least trick it into thinking it "is" supported. If not, is it possible to replace this bios with another one?
in your original post you had rdram and then purchased sdram,which is like mixing oil and water
i havent mentioned SDRAM even once in both my posts, i dont know where you are reading this. both the original sticks and the new sticks ive bought are Rambus (RDRAM). the little notches on RDRAM and SDRAM are totaly different, i wouldnt even be able to plug SDRAM into my mother board. The new sticks of RDRAM that i bought plug in perfectly and techincaly should work, but the bios halts the system before it even trys to boot up. both sticks are 16 bit and 45ns. the only difference is that the originals are pc1066 non-ecc and the new ones are pc800 ecc. even on rambus's web site it says that both these ram sticks are compatable.
Does your Bios have a ECC setting?

If so you might want to try working the new Ram sticks with ECC on and see if it works.
i cant change the ecc setting (or any ram setting) in my bios, all it lets me do is view whats in the 4 ports.
Some boards can run ECC with NON-ECC Ram in Non-ECC mode. But in this case it appears that your motherboard is not able to do this.

I would put it back on Ebay and sell it.
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