1.5GB of ram is it possible?????

I've seen a few post with people stating that they've 1.5GBs of ram is this a typo or is this something that can be done.

 

This simly means that the person has a 1GB stick (1024MB) + a 512MB stick. Also, others (such as myself) have 1.25GBs of RAM, which is a 1GB stick + 256MB stick (256MB = 1/4 1024MB).

 

Yeah you can do that. You just won't get the benifits of DDR2 ram.
Tim

 

By DDR2 you actually mean dual channel, right?

 

Yeah, that's one of the drawbacks

EDIT: Still, its better than leaving out that extra stick of RAM you've got (if you've got one)

 

You guys are mixing things up. DDR2 has nothing to do with dual-channel. DDR1 can run in dual-channel as well. As far as I know, you need matching size sticks of ram to run in dual-channel...although most of my knowledge comes from desktop AMD systems and not Intel notebooks.

 

The more recent models of Core Duo and Turion64 X2 laptops (the Intel ones should have the 945 chipset) support DDR2 in dual channel. You need matched size pair modules for the dual channel to work, even better if they are also matched in timings (for stability).

 

Actually, you do not need two identical sticks of RAM to have them run in dual-channel mode for the Intel system, it's a feature called asynchronous dual-chanel. It doesn't really help performance, but it's still dual-channel. I don't know if AMD platforms support this feature.

Either way, 1.5GB of RAM is possible as stated, don't worry about the dual-channel stuff.

 

Some laptop models that I've seen actually have 1.5 GB as the max RAM available. It's definitely possible.

 

I didn't think you could have different sticks of RAM,interesting-----but I don't see the point if there is no benefits.If you had mix matching sticks would it run at the higher speed or the lower one ?

Thanxs all in advance, learning alot here

 

the 945 chipset will allow mismatched pairs to work with full dual channel support, it will just default to the timings of the slowest stick, meaning if you have 2 sticks of 512 533, and one stick of 1 gig 667, you will have 1.5 gigs running at 533, then later on you can put in another gig of 667 and net two gig running at 667, and as far as I'm aware no amd chipset allows this yet, each bank needs to be the same density, and if your using a double sided dimm in channel a, you have to use a double sided dimm in channel b,

running mismatched pairs in dual channel is good for dell users, as most of their systems ship with 2x512, you can add one 1gig of faster ram, and continue to use one original 512, vs shelling out for two new sticks at once, makes the upgrading process a little more convient

 

The new AMD chipsets do.

 

What exactly does single channel and dual channel means???

How does it work???

Is there any noticeable performance gain from single channel to dual channel??

 

Dual channel gives very minor improvements... It's not worth it. You're much better with more RAM than any dual channel mode.

Dual channel mode may gain 1-10% in memory performance but overall system performance is far far far far less. It's not really noticeable so don't worry about it.

I would rather have additional ram even if it was only a 128mb than I would to have dual channel.