10 ns chips != PC100 ?

[OS]

I bought a stick of CL2 PC100 kingston value ram but it has 10 ns hyundai chips on it. I thought the PC100 specs don't allow this? What gives?

 

[mcbiff]

10 ns is PC100, 1000/10=100.

 

[pillage2001]

Use the equation f=1/t......

 

[OS]

<< One of the most often misunderstood and misquoted pieces of information from this specification is the tCLK value. Many have used this to claim that for PC100 (100MHz) operation, the chip only needs to be 10ns. The fact is that tCLK indicates the system clock speed, not the chip speed. >>





<< Almost all highly regarded memory and module manufacturers recommend 8ns chips to ensure proper operation at 100MHz. >>



Memory Buyer's Guide
By
Dean R. Kent
Real World Industries
Colton, CA
http://www.realworldtech.com

 

[Sunner]

There are lots of 10ns PC100 sticks.
10ns chips is one of the requirements for calling a stick PC100.

In fact, Im running one 64 MB and one 128 MB stick of PC100 in my Duron system now, working fine.

 

[OS]

<< Some SDRAM chips shipped today are specified at 10ns and are often called 100 MHz chips. These will not allow a module to operate at 100 MHz, and are not PC100 compliant >>



linky

 

[Mday]

actually PC100 SDRAM specifications call for 8ns chips (125MHz)

some ram with 10 ns (100 MHz) chips are labeled pc100. that is why some pc66 SDRAM modules run at 100MHz, since they are 10ns.

my PC 100 SDRAM modules have 8ns chips ;-)

remember, chips have a certain &quot;tolerance&quot; built in which is why some pc100 modules with 8ns chips can run at 133 MHz.

 

[mcbiff]

All I know is that my 10 ns PC100 modules have been running great for 2 years, even at 124 Mhz. Maybe I just got lucky?

 

[Viperoni]

Hyundai is great ram.
Beautiful overclocker on the tnt-2 series of card
I wouldn't be surprised if yours hit 124, probably @ cas2 as well.

 

[mcbiff]

It is Hyundai ram, now that you mention it. Maybe that's why it's been so good.

 

[pinhead]

I was wondering about the same a while ago and found an intel white paper posted at memman.com or another memory vendor. As I remember it states that a 10ns memory cannot run faster than 87mhz bus speed, that to be true pc100 it has to be faster than 10ns. I'm not an expert on this either so YMMV.

 

[pinhead]

OK, I found the page, check out item #7 at the bottom. memman white paper hope this helps. Heck, I just hope this link works, I'm pretty new to this.

 

[Mark R]

10 ns is an acceptable timing for PC100 RAM. Like most important specifications it is a minimum requirement, so 8 ns will also be acceptable.

However, not all 10 ns RAM is PC100 - there are a number of other parameters that must be satisfied (the most important being Tac which must be less than 6 ns - most non PC100 10 ns RAM has Tac of 8 ns or greater).

 

[odog]

finally mark!.... i was waiting for someone to mention that....


SDRAM has two times you have to be concerned about.... cycle(usually whats mentioned) and access(usually not mentioned) for PC100 the bare minimum is 10ns cycle and 6ns access... if you meet those specs, you are PC100 i used to have a few sticks of LG 7J's, they met these specs exactly...(and actually ran at 112mhz CAS2) sometimes you get into trouble with ppl advertising the access times rather then the cycle times... this gets confusing for some ppl, as they think they are getting 4.7ns PC133(as in 7.5ns cycle and 4.7ns access) that just plain sucks... but it does happen so watch out

 

[Serville]

I have PC66 (-10) CAS3 that runs stable at 144MHz CAS3. I used to run Duron700@1026 (108x9.5) at 1.85V. I just changed my Duron to run only at 1GHz (10x100) at 1.775 after my Plextor 1210TA arrived. It now runs only at 133 CAS3. I just don't want to overclk my Plextor...too risky for me for such an expensive CDRW

 

[Serville]

I have PC66 (-10) CAS3 that runs stable at 144MHz CAS3. I used to run Duron700@1026 (108x9.5) at 1.85V. I just changed my Duron to run only at 1GHz (10x100) at 1.775 after my Plextor 1210TA arrived. It now runs only at 133 CAS3. I just don't want to overclk my Plextor...too risky for me for such an expensive CDRW

 

[OS]

so whats the deal, should I complain to kingston?

 

[Mr.IncrediblyBored]

The question is: Are you having any problems or do you plan on overclocking?

If you haven't any stability problems, then I suppose you shouldn't worry about it.

If you're overclocking, return that sucker.