Choosing new DDR1 memory !

[dedantemon]

Hello guys,

I have this motherboard http://www.asrock.com/MB/overview.asp?Model=P4VM900-SATA2 and these ram modules:

I want to replace the 256 ram one with this one: http://www.pcgarage.ro/memorii/sycron/1-gb-400-mhz/

Will the 512 one be compatible with the 1Gb one?

 

[jaquith]

specs -> Supports DDR400 x 2 DIMM slots, maximum capacity up to 4GB
Current 200MHz 3-3-3-8 @ 2.5v
Proposed 400 MHz 3-?-?-? @ ??v

Nope, don't mix them the Speed alone will cause you problems. If you purchased (2) sticks of "400 MHz" then maybe. Just verify per: 1. MOBO QVL List, or 2. RAM Mfg's Website Configuration per MOBO, or 3. RAM Mfg Approved via email or online ticket.

 

[JDFan]

specs -> Supports DDR400 x 2 DIMM slots, maximum capacity up to 4GB
Current 200MHz 3-3-3-8 @ 2.5v
Proposed 400 MHz 3-?-?-? @ ??v

Nope, don't mix them the Speed alone will cause you problems. If you purchased (2) sticks of "400 MHz" then maybe. Just verify per: 1. MOBO QVL List, or 2. RAM Mfg's Website Configuration per MOBO, or 3. RAM Mfg Approved via email or online ticket.

Current is pc3200 which runs at an actual 400mhz. speed!! -- CPU-z reports it as 200 since that is the actual bus speed but is DDR so 2x200=400Mhz running speed (notice the module is rated pc3200 !) so current 512MB module is PC3200(200) or 400Mhz. 2.5-3-3-7@2.5v not 200Mhz. !

 

[jaquith]

I get DDR {DDR, DDR2, DDR3 all as being Double Data Rate}; my over sight 3200/8 = 400MHz. Laziness.

That said, it's also more, besides the Speed, CAS Timings, Voltage, and Type {including chips per side/etc; SS/DS}. Adding more, you also need to verify with your manual 'if' you can mix densities 0.5GB + 1GB. There are so many things in your instance I don't want to fair a guess.

Yes, you can even mix Speed + Timings - but too often even with BIOS settings it can fail:

200MHz 3-3-3-8 @ 2.5v
400MHz 3-4-3-8 @ 2.2v
=================
200 MHz 3-4-3-8 @ 2.35v

Don't let my quick 200 MHz confuse the fact 'I get' RAM. For MANY reasons I wouldn't mix them.

 

[dedantemon]

I can also buy this http://www.emag.ro/memorii/memorie-kingmax-1gb-ddr-400mhz-pc3200-tsop--pMPXD4-DDR1G400

It costs 10 $ more (to understand the price difference), but it is from same producer, Kingmax.

Different densities I can mix, because I have 256+512 atm, from different producers.

 

[jaquith]

As long as you have checked the density differences, and that memory is non-ECC then it should work.