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b004u

I went to .crucial and they given me many products that

is compatiable with my laptop. My laptop currently has a 2gb memory

already built in. I'll provide a link for you guys to review on my

compatiablity. I've noticed that it reccomended me to buy a $30 product

2gb 200-Pin Sodimm , which this will have my laptop maximized at

4gb. I want the best performance on this laptop and should I replace the

first slot , and adding a 4gb kit (2gbx2) . Because its matching

pairs , I think I should do it ? Should I look into buying from crucial?

Pavilion dv6646us

hcavolsdsadgadsg · Posted: Mon Aug 10, 2009 1:46 am Post subject:

Don't bother unless you have a 64 bit OS.

Polynomial · Posted: Mon Aug 10, 2009 6:19 am Post subject:

Yeah, unfortunately 32-bit OSes have an addressing limit of 3GB. You could buy a 1GB stick to get up to 3GB, which would increase your performance somewhat if you're using Vista (or if you're running several very large apps on XP).

I'd recommend Crucial or Kingston for laptop memory, both have served me well.

Saifallofjmr · Posted: Mon Aug 10, 2009 6:20 am Post subject:

Polynomial · Posted: Mon Aug 10, 2009 7:28 am Post subject:

No, it is not 4GB. You're talking about the addressing limit for 32-bit address space, whereas I'm talking about the actual amount you can use. In theory, it should be 4GB, but in practice it is not.

In 32-bit Windows operating systems, each process can only address up to 3GB of physical memory. This is called the memory barrier. Your OS itself will see the 4GB, but you will never actually get to use the final 1GB.

The machine I'm running right now has 4GB of RAM, yet task manager shows 3145204 KB. This is because the task manager process can only see up to the 3GB limit.

Your machine will never allow the processes to access that final 1GB of memory - even if you run two 2GB processes the memory manager will simply page out 500MB or so of each to bring it down to 3GB total physical.

b004u · Posted: Mon Aug 10, 2009 9:25 am Post subject:

yeah, i'm gonna install x64.

What product you think I should get? You can choose for me or I might just go with the 2gbx2 kit

To0k' · Posted: Mon Aug 10, 2009 9:27 am Post subject:

Polynomial · Posted: Mon Aug 10, 2009 9:48 am Post subject:

b004u - Do you have a 64-bit capable processor? Unless it's an AMD64 or Core 2, the chances are it's not capable.

Check your current RAM speed. It should be written on the stick's label somewhere. If it's the same as the matching pairs, I would just buy another 2GB stick and be done with it. If it's slower than the matching pairs, get them instead and replace the old stick.

Buying a second stick with identical timings is not going to make much difference than buying another stick with different timings, as long as the speed is the same (e.g. PC3200, PC5400, etc).

b004u · Posted: Mon Aug 10, 2009 10:31 am Post subject:

Polynomial · Posted: Mon Aug 10, 2009 11:52 am Post subject:

Yeah, that's perfect. Get the 4GB matched pair and install a 64-bit OS.

b004u · Posted: Mon Aug 10, 2009 11:58 am Post subject:

Will I need to prepare a recovery disk if something happens? I'm gonna download a windows vista home premium x64 edition but will it be illegal ?

Saifallofjmr · Posted: Mon Aug 10, 2009 1:25 pm Post subject:

b004u · Posted: Mon Aug 10, 2009 2:20 pm Post subject:

Mine is a NVIDA GeForce GO 7150M graphics

Polynomial · Posted: Mon Aug 10, 2009 2:41 pm Post subject: