DDR vs DDR2

mushbrain · 12-02-2008, 12:30 PM

Hi - sent off for new RAM - requested 1GB 533MHz DDR2 SODIMM MEM16 but received 1GB 533MHz DDR SODIMM MEM16.

I did not notice this till after installing it. It recognises the new DDR but ignores my old DDR2 512Mb stick.
I hope this is reason for the problem.
I am running Satellite Toshiba L100-179, XP (SP3)
Any ideas? Am I right in my diagnosis?

Thanks

**wrench97** · 12-02-2008, 03:29 PM

DDR did not come in 533Mhz speed so I would think you got DDR2.
Did you put the new ram in the slot the old ram was used or into a empty slot?
You may want to check the old ram is fully seated in the slot they can be hard to put in easy to knock loose sometimes.

mushbrain · 12-02-2008, 03:40 PM

If I take the 1G B Ram out, (I have two slots) my machine recognises the the 512mb stick (without touching it) - so it is seated correctly. The minute I put the 1GB in - it reverts to only seeing the 1GB slot again. Very strange! Downloaded Berlac and that what it reads!

**wrench97** · 12-02-2008, 03:42 PM

Try switching the sticks around.

mushbrain · 12-02-2008, 10:52 PM

Tried it with every combination of 1mb stick an the two 512mb sticks - the machine just wont recognise it - bizarre!

**wrench97** · 12-03-2008, 12:33 AM

If it recognizes 2 512's but not anything with the 1 gig the I would have to think the 1 gig stick is not compatible with the laptop you should be using 2 matched sticks for dual channel mode which is faster then single channel mode with unmatched sticks.

12-02-2008, 12:30 PM	#1 (permalink)
mushbrain Registered User Join Date: Mar 2008 Posts: 3 OS: XP SP2	DDR vs DDR2 Hi - sent off for new RAM - requested 1GB 533MHz DDR2 SODIMM MEM16 but received 1GB 533MHz DDR SODIMM MEM16. I did not notice this till after installing it. It recognises the new DDR but ignores my old DDR2 512Mb stick. I hope this is reason for the problem. I am running Satellite Toshiba L100-179, XP (SP3) Any ideas? Am I right in my diagnosis? Thanks

12-02-2008, 03:29 PM	#2 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Posts: 14,216 OS: XPSP3	Re: DDR vs DDR2 DDR did not come in 533Mhz speed so I would think you got DDR2. Did you put the new ram in the slot the old ram was used or into a empty slot? You may want to check the old ram is fully seated in the slot they can be hard to put in easy to knock loose sometimes. __________________ Power Supply and Selection

12-02-2008, 03:40 PM	#3 (permalink)
mushbrain Registered User Join Date: Mar 2008 Posts: 3 OS: XP SP2	Re: DDR vs DDR2 If I take the 1G B Ram out, (I have two slots) my machine recognises the the 512mb stick (without touching it) - so it is seated correctly. The minute I put the 1GB in - it reverts to only seeing the 1GB slot again. Very strange! Downloaded Berlac and that what it reads!

12-02-2008, 03:42 PM	#4 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Posts: 14,216 OS: XPSP3	Re: DDR vs DDR2 Try switching the sticks around. __________________ Power Supply and Selection

12-02-2008, 10:52 PM	#5 (permalink)
mushbrain Registered User Join Date: Mar 2008 Posts: 3 OS: XP SP2	Re: DDR vs DDR2 Tried it with every combination of 1mb stick an the two 512mb sticks - the machine just wont recognise it - bizarre!

12-03-2008, 12:33 AM	#6 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Posts: 14,216 OS: XPSP3	Re: DDR vs DDR2 If it recognizes 2 512's but not anything with the 1 gig the I would have to think the 1 gig stick is not compatible with the laptop you should be using 2 matched sticks for dual channel mode which is faster then single channel mode with unmatched sticks. __________________ Power Supply and Selection