PC 100 CAS 3, 10 ns RAM. FSB limits?

[Bovon]

PC 100 CAS 3, 10 ns RAM. FSB limits?


I usually buy CAS 2 RAM modules, but need some older PC 100 for a FIC board that dosn't like PC 133, and have found a good buy in some NEC PC 100 CAS 3 10 ns modules.

Anybody ever push any CAS 3 RAM in clocking a system? This machine is clocked to 112 FSB, and I feel like CAS 3 RAM would run fine at that frequency, but if its close to the cut off for PC 100 CAS 3, I better buy some new CAS 2.

Any input anybody?...

Tnx.

[AllGamer]

What is the point?

i rather buy newer 133 sticks and have them run there, so when i need them i can always swap it with another machine with higher bus.

since they run and cost the same, i don't really see what improvement you can have with old 100 sticks.

mind if you shed some lights to illuminate this grommy though?

[NDD]

a FIC board that dosn't like PC 133

That's the point, AllGamer.
I had Micron PC100 CAS3 ram doing PC133 CAS3 (in Gigabyte 7ZX) with no sweat, I wonder if your NEC can do the same.

[Bovon]

Er...ummmm, please recheck my post:

I usually buy CAS 2 RAM modules, but need some older PC 100 for a FIC board that dosn't like PC 133, and have found a good buy in some NEC PC 100 CAS 3 10 ns modules.

I have both PC 100 and PC 133 on hand...in 128 mb modules. This board only runs PC 100. It only has two DIMM slots. I would like to try 512 mb but will need 2 - 256 mb modules. I can get 2 - 256 mb modules of NEC CAS 3 for a reasonable price...so...why not?...just trying to find out beforehand if the CAS 3 will run at 112 mhz fsb. When I say reasonable price, its like just about the same as Crucials 128 mb PC 100 modules.

[AllGamer]

So basically you are wondering if the 133 can go to 112 ??

as if you were just OC-ing a normal 100 to 112 ??

if that's the case then yeah, of course it can be done

[Bovon]

ND, I am not 100% sure its 10 ns, but it probably is. Here is the data from the chips:

D45128441g5-a10b-9jf
0038e5402

And a URL the guy gave me to check them out. The chip markings don't exactly match thoase on the page...ie, D45128441g5 ect ect...the NEC chip markings seem to be either 42 or 48. I don't find any chips with 45 (or D45).

http://www.chipmunk.nl/DRAM/NEC.htm

Do you know of any other sites that can shed any light on these chips?..

[Bovon]

Originally posted by AllGamer
So basically you are wondering if the 133 can go to 112 ??

as if you were just OC-ing a normal 100 to 112 ??

if that's the case then yeah, of course it can be done

Sorry, maybe I better back up 15 and punt!

Ok...here is what I have...

I have a FIC VA 503+ mainboard with a K6-2+ 533 processor, overclocked to 620 mhz. It is clocked by the fsb to 112 mhz and multiplier to 5.5 (X 112 mhz). This mainboard will not run PC 133 ram..already tried it and failed. It has 2 DIMM slots. I only have ram in 128 mb modules. So...I have a chance of buying 2 modules of NEC 256 mb (CAS 3?) 10 ns for about the same price as 2 modules of new Crucial CAS 2 128 mb modules. (more bang for the buck...you see.) That would be good to get this thing running with 512 mb ram...if the cheaper NEC will work..otherwise, I'll stick with the 256 Crucial that in here now...

Hokay?

[AllGamer]

seems like 9 ns to me

[NDD]

Got your PM, but prefer answering here, if it's OK with you
I do aware of mobos which won't accept PC133 by any means. In your case, what you're asking for is to be sure that PC100 CAS3 will work when o/ced to 112MHz. Correct ? Well, I can't really be sure. It depends both on mobo and on the specific RAM, as you already know. It MIGHT work well, and it might NOT
10ns memory is rated for 100MHz. 9ns for ~111MHz, but I had some Infenion 64MB PC100 once (don't remember what CAS) with 9ns chips which won't even pass the 110MHz it was rated for
On the other hand you have an example from my previous post of Micron PC133 CAS3 (10ns chips) which easily did 133MHz.

Will you have an option to return it if it fails on you ?

[Bovon]

Ok ND, I guess what I was looking for was some responses from O/Cers that have some experience in using various CAS modules in over clocking attemps. I know it is pretty iffy and marginal at best..and sence I have done little in the way of over clocking, I thought maybe someone here had pushed some ram thru the hoops.

Thats fine about answering the PM here...I forgot to add that to the PM to just comment here...but the reason for the PM was to get your attention back to this thead just in case..

There are 3 modules available. I think what I will do is, buy one module...try it in the O/C'd board, and if it runs ok...buy the rest of them. If it dosn't run, then I can still use one module in a system I am putting together that will run at 100 mhz fsb.

Thanks wallijonn, maybe it will...but 10 ns ram chips are not designed to run at much over 100 mhz, if any.

[AllGamer]

Originally posted by Bovon
...but 10 ns ram chips are not designed to run at much over 100 mhz, if any.

well as ND said earlier about being able to take it to 133

i guess as any electronic components, it all depends on the Quality of the stuff.

[bigblue]

You should be able to get "just barely" 133mhz out of it/them. But getting 620 out of a K6-533 is really good. If you are troubleshooting an overclocking problem, you might be at the limit of the K6, not the 100 memory. The K6 tends to overheat quite easily. PC133 is suppose to run at 100mhz. I did that quite a bit with my K6-500.

[NDD]

well as ND said earlier about being able to take it to 133

Micron, baby, the magic word is Micron

[123eskk]

i've a micron CL2 pc100 sdram which can do 133mhz at CL2 !