yes....memory again.... :D

ok - i reviewed a few threads about memory for the 15...

i have below links to possible contenders for the 15.

link 1 OCZ 800 4G 6400
link 2 OCZ 667 4G 5400
link 3 GSkill 667 4G 5300
link 4 GSkill 667 4G 5300 w/ Heat Spreaders

now....there are others, i know, and if you see one better let me know plz.

i also have asked and seemed to have forgotten the difference between the 5400 and 5300 units...what does that number mean? is there a huge difference?

I know the 800 will downclock, but will it really run a bit cooler and run lower latency then the 667 or is this a myth?

also - the heat spreader GSkill....one person posted in the newegg reviews they fit into the m15x, but do you think they will really be a benefit?

thanks all....

 

If I were you I wouldn't waste the $$ on the 800 mhz stick... it won't really help you in any way.

Also, if I were you I would check out Corsair ram... other than that, just make sure the company you go with has a lifetime warranty, and you're set!

Hope this helps!

 

Well, some companies such as OCZ and Corsair test/stress their RAM at 675MHz, hence the 675*8 = PC2-5400.

The 3rd Link G.Skill is better - DDR2-667 CL=4. (4th Link - CL=5)

I do believe the timings will downclock alongwith the frequency, but there have been verbal contradications to my findings....

The performance boost due to the lower CL will be evident in Intensive tasks, so go for the cheaper OCZ (with MIR). (And you can confirm whether timings downclock or not.)

 

theres not really a point in heat spreaders for ram running at 667 mhz. the kingston ram i have in my m15x has no heat spreaders and its working fine. i would go with the g.skill ram for the lifetime warranty.

 

andy: what am i looking at in the timings table for the first at 333 and the second at 400?

 

i have had several makers in my units (desktop though) and all did ok...the last batch i got was GSkill and they are great, and as you said...lifetime warranty....so i lean towards them more.
(besides: they have kewls packaging.... )

 

if you take a look at your 3rd link. You will see that under Timing (Cas Latency) its 4-4-4-12. It means that, that ram is suppose to be faster but you wont really notice a difference with cas latency 5-5-5-15

 

In the SPD, 400MHz (6-6-6-18) and 333MHz (5-5-5-15) [First 4 rows below the frequency]

In the memory table you can see the RAM has downclocked to 332MHz with the timings at 5-5-5-15. (CL = 5)

The RAM was Crucial's PC2-6400 CL=6.

Few more links depicting PC2-5300 downclocking to PC2-4200 alongwith the timings
http://forum.notebookreview.com/attachment.php?attachmentid=22712&d=1219061677
http://forum.notebookreview.com/attachment.php?attachmentid=22713&d=1219061677

The timings are pre-coded for each frequency, so when the frequency downclocks, so do the corresponding timings....But some users do not agree with me, and come up with JEDEC sh*t and all

 

Something about heat-spreaders --> http://forum.notebookreview.com/showpost.php?p=3831626&postcount=6

 

I have link3. They are grrrreat

 

So when it comes to the m15, what is the better Cas Latency to get, 4 or 5?

and 5300 or 5400 or 6400?

 

CAS latency, in the strictest sense, it's better to have lower. with the PC2-5400/6400 ... technically the higher the number the better... however, PC2-5400 (DDR2 667Mhz) is the fastest RAM the system will support.

In the end, the difference between PC2-5300 CAS5 and PC2-6400 CAS4 will be so insignificant, it won't matter. So if you can save money, buy exactly what this system is spec'd for. PC2-5400 (DDR2 667Mhz). anything more will be wasted, anything less probably costs the same anyways.

 

Thanx Mystic, that helped, I saw 5300 with cas lat of 3, wans't sure if it would be better than 5400 CL 5.

 

A small correction.. since your Processor is running at 800Mhz it will support even PC6400 with CAS 5, but due to BIOS limitation and chipset limitation your memory will be running at PC5300 @ CAS 4 which is quite a good deal. Lower CAS means more stability while higher MHz means faster data access. You should keep a good balance of both.

I was lucky to get a PC6400 for the cost of PC5300 (even less by few $$$) now it runs at 667Mhz @ CAS 4

 

I've found this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148159

but it list CL at 6

 

This is what you need:

http://www.newegg.com/Product/Product.aspx?Item=N82E16820148201

 

I appreciate your link milcs, however I'm one of those that prefer to waste more money on stuff I think is better, even it it is only a lightest bit better, besides, if I can install the pc6400 and someday sale the m15x, and buy something that will use up to 6400, than I wont have to go and buy more. I try to think in the long term, and not buy things twice.

 

Milcs is right, I bought the same one and I cannot bet was that all my luck or all those dims are PC6400 because I got PC6400

I have a link to the same RAM in my signature and CPUID information about RAM here - http://forum.notebookreview.com/attachment.php?attachmentid=22658&d=1218984019

 

But:
1- PC6400 is not better for the m15x and won't be better on your computer. It will downclock and I honestly don't even know if that will have any other influence. More, if some problem arises, AW will pick that up to justify not taking responsability for any damage your laptop might suffer.

2- I can bet with you, you will never use this memory again. As you are aware, montevina is out and very soon, most of the laptops will be using DDR3.

 

Yes, I see clearly now

ok and thres also no difference between 5300 and 5400?

 

nope. just Crucial (or was it Corsair?) trying to impress n00bs