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PC2100 / PC2700 / PC3200 ??????

Trish's Escape from Hardware Hell Help Board » Hardware » Memory Related » PC2100 / PC2700 / PC3200 ?????? « Previous Next »

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Posted on Sunday, January 18, 2004 - 9:21 am:   

Help - I'm confused !!

My mobo specs read that I can use PC1600 & PC2100.
Crucial upgrade site offers me 2100, 2700 & 3200.

Is this for real??
Can I use PC2700 & PC3200 on my mobo??
Its a Shuttle AK35GTR and as above, they recommend PC1600 & PC2100 - so who do I believe ??

Moderator (Es)
Username: Es

Registered: 6-2003
Posted on Sunday, January 18, 2004 - 3:25 pm:   

PC1600 & PC2100 is ok. 2700 will work but only at 266 FSB (or overclock), unlikely to get DDR 400 or PC3200 to work at all. Been there done that sort of thing.
Posted on Sunday, January 18, 2004 - 9:36 pm:   

Thanks Es.

I presume I just fit the board & away it goes.
Would I have to change any BIOS settings or dipp switches as my mobo supports DDR200/266 & I think PC2700 is DDR333 ??

Sorry to be a dummy asking newbie questions but memory is the one thing I have avoided by buying mucho additional at build time therefore never upgraded it, ever, until now.

Having similar fun with PC100 & PC133 compatability between two old Jetway boards but thats another story.

If you know of any good web sites with clear explanations of memory, PC100/133, PC16/21/27/3200, 100/133x2/3/4, 200/266/333/400 & all that, I'd be quite interested - knowledge is power after all.

Thanks again for your help.
Posted on Sunday, January 18, 2004 - 9:44 pm:   

Just in case anyone is interested, I found this link which, while brief, made sense to me.

Any more in depth explanations are welcomed tho', especially if it explains how you can run 166/200MHz stuff on a 133Mhz mobo ( see my first posting ).

Posted on Sunday, January 18, 2004 - 10:40 pm:   

Got some stats on memory that clear up why you can run your PC2700 on a 266MHz cycle.

This is for Crucial Part CT3264Z335 - 256Mb PC2700 333FSB :-
Allowable Clock Speeds @ CL2 ---- 75 - 133 MHz
Allowable Clock Speed @ CL2.5 --- 75 - 167 MHz

Your PC2100 is 266FSB = 2x133.
PC2700 is 2x166 so if your cas is 2.5, it'll go, if its 2, it won't.
Therefore get PC2700 (DDR333) CL2.5 !!!

PC3200 is 2x200 (DDR400) - have no stats showing variable clock speeds to CL ratio as above, so cannot advise as to whether this is suitable for your needs.

Hope that helps

If all time is relative, there can be no such concept as being. Discuss.
Posted on Sunday, January 18, 2004 - 10:53 pm:   

I sort of see what you mean.
I think you crossed wires, but it is late.
(Not criticising so don't be offended!)

I think you mean I can use PC2700 if Cas is @ 2 - as it'll run upto 133 MHz.
If I run at Cas 2.5 it'll also work as it goes upto 167 MHz & 133 is less than that.
I'm presuming the variable speeds mean it runs anywhere between these two values as the systems lowest denominator dictates.

Thanks to both respondents for your help & advice.
Moderator (Es)
Username: Es

Registered: 6-2003
Posted on Monday, January 19, 2004 - 8:14 pm:   

Just to reitterate on SuperFlyGuy's post Cas latency of memory is important as most CAS2 DDR will run fine at 2.5 as it is supported by 99% of all DDR Motherboards at 266 FSB. Cas3 latency will normally fall back to 2.5 if and only if the memory controller on the motherboard can initialize it which is not a common trait among early DDR chipset motherboards. If DDR400 memory is to be used on a 266 FSB motherboard than cas2 or 2.5 is the preferred Cas Latency which I believe Micron/Crucial has upto 128 meg batches aka 128meg X single density on 2 sides of a stick is 256 meg total but the timings of this type of memory can be troublesome on some motherboards. DDR 266 333 and 400 in 256 & 512meg sticks of memory are more common in single sided configurations as they are generally cheaper to make. Where I work we carry both hi and lo density types and I was notified today that some new motherboards will not P.O.S.T. with low density 512 meg DDR400 memory even tho the boards are designed for DDR400 support. Which is just the opposite of some SDRAM boards. Alot of of PC100 boards don't like hi density memory. There is something new everyday in the exciting world of computers.
Posted on Tuesday, January 20, 2004 - 9:38 pm:   

Thanks again Es

I'll try the 2700 as I may upgrade mobo soon - I can currently run upto xp2100+ ( I think ) although I have a 1900+ fitted right now.

As & when, I may go higher and looking at what's out there to my needs & budget, they seem to be clocking 333MHz which means I'll have usable memory now & then.


Bill Snowden
Posted on Monday, February 9, 2004 - 1:12 pm:   

Please expand on this.I am trying to purchase ram for 3 different boards.All 3 will accept Pc2700 133.The problem comes in from voltage.I cannot find if voltage is backward compatible.1 board calls for 2.5 volt..1 board calls for 5. volt and another calls for 2.7...Have at it guys and MUCH Thanx ahead of time..
Moderator (Es)
Username: Es

Registered: 6-2003
Posted on Monday, February 9, 2004 - 8:17 pm:   

DDR pc2100 and pc2700 at 2.5 volts DDR pc3200 can also run at 2.5 volts and some is rated to 2.8 volts such as OCZ memory. Sdram pc100 and pc133 at 3.3 volts. Your 5 volt rated motherboard sounds like it uses SIMMS and not DIMMS so you may want to double check whether it actually uses a 72 pin config or even an EDO 5 volt based 168 pin DIMM.

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