coudl someone explain more technical RAM stuff to me?

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spa.ere

New Member
#1
heyo, i'm looking to get myself some high quality pc-133 dimm's, but i don't know what these terms people use when overclocking (and talking about ram) mean like CAS, latency etc.. if someone could explain it to me and give me a general suggestion it'd be really helpful! thanks, right now i'm just running generic pc-100, does it really make a huge difference between say crucial and generic?
 
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gregm

New Member
#2
High quality ram is important if you are overclocking as when you go above 133 FSB only good ram will work. I cant remeber quite what CAS actualy means but dimms will either be cas 2 or 3 with 2 being the best. The performance increase depends on what you do but it seams to speed SETI up a fair bit


I think that mushkin 133 high performance revision 2 is about as good as you get.

Sorry if this makes no sence as it is 5:40 in the morning and my brain just fell asleep.
 
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S_Klass

New Member
#3
CAS = CL = CAS Latency
These 3 terms refer to the same thing which is the latency timing of the SDRAM chips. The lower being better. Currently only the most premium SDRAM (HSDRAM from EMS) markets it self as CAS 2 PC133 SDRAM. About half of the PC100 SDRAM out there will run at 124-133MHz if you set it to CAS 3. Few will if any will run at PC133 at CAS 2. On the other hand, about half of the PC133 SDRAM out there will do 133-140MHz at CAS 2.

Premium SDRAM modules such as those by Crucial may differ in only the PCB and the speed ratings on the chips. For example a generic 128MB SDRAM may have a 7ns speed rating whilst the premium brand SDRAM may be rated at 6ns and are built on PCBs made to more exacting standards.

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-=S_Klass=- I tweak... therefore I am.
 
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gregm

New Member
#4
Thats what I ment to say, so if like people here you hope to get your FSB to 140+ (Like a lot of the SETI crushers here) then its worth paying for the better ram.
 
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Ducky 363

New Member
#5
My question then is this: Is the Mushkin Rev. 2 SDRAM better than the HSDRAM from Enhanced Memory System?
 
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gregm

New Member
#6
I have heard that they are as good as each other but I have not tested either. Both are very good and I dought that a cpu will handle high enough FSB's to defeat either.
 
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S_Klass

New Member
#7
The Mushkin Rev.2 SDRAM has been rated at 146MHz with a CAS 2 setting on one test! That's very impressive. Another test had the Mushkin top out at 144MHz with CAS 2 setting while the EMS HSDRAM managed only a 135MHz FSB at CAS 2. Here's the cavet, Mushkin's Rev 1.5 SDRAM performed just as well as the Rev 2.0 SDRAM but costs $40 less!

EMS's HSDRAM does however lay claim to the "Fastest SDRAM" title as it's built with blazing 4.6ns chips while others have chips rated at about 6ns.

If money is a factor, also consider SDRAM by chip makers Siemens and Infineon. SDRAM with chips from these makers have been rated at 138+MHz with CAS 2 settings.

Warning! Just as there are varying yields on CPUs, there are varying yields on SDRAM. Therefore your mileage may vary!


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-=S_Klass=- I tweak... therefore I am.
 
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NiteOwl

New Member
#8
HSDRAM has 4.6 ns clock access time. It uses 7.5 ns chips

It is kinda picky on mobo. Some have it @ 2-2-2 @ 140 MHz while it will only do 2-2-2 @ less than 140 MHz on my Soyo 6BA+III (running @ 3-2-2 with Precharge @ 144 Mhz right now). I also have a stick of Mushkin rev2 @ 150 MHz with 2-2-2 and precharge on. Also, EMS officially rates HSDRAM as 3-2-2 (before it rated itself as 2-2-2), but it does 2-2-2 @ 133 Mhz for sure.

[This message has been edited by NiteOwl (edited 05-27-2000).]
 
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NiteOwl

New Member
#9
PS, before you assume your generic RAM won't do high FSB, give it a try first. Before I had generic PC 100 8 ns RAM that was manufactured by Seimens and that went upto 140 MHz without a problem. So try it out first and only fork out your wallet after you know for sure it aren't good enough.
 
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mojo2000

New Member
#10
Can somebODY please!!

let me into the secret of how to overclock ram..
step by step please????

*crying into his mother lap*


Originally posted by NiteOwl:
HSDRAM has 4.6 ns clock access time. It uses 7.5 ns chips

It is kinda picky on mobo. Some have it @ 2-2-2 @ 140 MHz while it will only do 2-2-2 @ less than 140 MHz on my Soyo 6BA+III (running @ 3-2-2 with Precharge @ 144 Mhz right now). I also have a stick of Mushkin rev2 @ 150 MHz with 2-2-2 and precharge on. Also, EMS officially rates HSDRAM as 3-2-2 (before it rated itself as 2-2-2), but it does 2-2-2 @ 133 Mhz for sure.

[This message has been edited by NiteOwl (edited 05-27-2000).]


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spa.ere

New Member
#11
yea i was sorta looking for an answer to how to set CAS etc, i've looked through my bios but only see one setting for precharge, latency, but i don't have three settings for those three numbers (and what do they mean anyways??


er and what's the difference between hsdram, just higher bus speed? does it work on a good ol bx board or do i need the new intel and via 133 chipsets?..

[This message has been edited by spa.ere (edited 05-27-2000).]
 
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gregm

New Member
#12
What mother board do you have? There is nomally an option labled cas latency in the bios, I think that it is usualy in the chipset section.
 
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gregm

New Member
#13
Yes it will work with a BX mother board but how fast you can get the FSB to take advatage of the ram depends on your Mother Board and CPU. In other words if your mother board dose not give you the option of going over 100MHZ or your CPU cannt handle it then you will gain nothing from the ram.

GREG
 
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gregm

New Member
#14
I could have said all this in one post but I didn’t. HSDRAM just means high-speed dram but it is just the name they have given it, it is normal ram but with higher quality components.
 
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NiteOwl

New Member
#15
yup, HSDRAM is just SDRAM, but has nice components and a slighlty faster clk access time, that's all
 
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S_Klass

New Member
#16
Originally posted by spa.ere:
i've looked through my bios but only see one setting for precharge, latency, but i don't have three settings for those three numbers
That's exactly the setting you need. If it's set to 3 now, change it to 2 and see if you run stabily. Run memory benchmarks such as SiSoft Sandra and or WinTune98 with CAS Latency set to 2, then 3 and see the difference!



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-=S_Klass=- I tweak... therefore I am.
 
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spa.ere

New Member
#20
so this CAS timing stuff, say 2-2-2, would jsut be cas set to two? what is like 2-2-3 and all that stuff?
!!!
 

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