RAM upgrade

jaypels · 04 Feb 2011

good day! i recently read this thread Maximum memory per slot? which pparks recommended the crucial site for memory upgrade.. i visited that site and entered my laptop model (acer 4745g) and found their RAMs cheap.. i am planning to upgrade a few weeks from now (still waiting for my payday) and since i already have 2gb installed, i do not want to throw away my installed ram.. i am planning to choose option 3 (2gb installed + 4gb upgrade) and they have two choices for RAM (see attached picture)..

i also checked speccy (see attached snip) and found i have three more slots available while the crucial site only said i have two slots.. i however would tend to believe i only have two slots available since most laptops only have two and why would my laptop model be the only exception?

if what speccy said was true, then i would plan to purchase another 2gb (2gb installed + 4gb upgrade + 2gb upgrade) so i would fully utilize my machine..

my question would be what RAM would i buy and is it good or can you recommend from another brand? i am from the philippines by the way so i would take shipping costs into consideration.. i may have further questions but we'll start with these ones..

richc46 · 04 Feb 2011

Of course you realize that if you have 32 bit Windows 7, additional ram would not serve any purpose.

jaypels · 04 Feb 2011

i know.. i would change to 64bit when i get the rams.. i would have asked questions when we get to that part :)

ignatzatsonic · 05 Feb 2011

Speccy is probably wrong about the number of slots---but I would open the case and confirm before I ordered anything. You are going to have to open the case to install RAM, so you may as well get familiar with the procedure.

Crucial is an excellent brand. Corsair is another good one, as is Kingston.

But make sure that the RAM you buy has the same specifications as the RAM choices shown by the Crucial configurator--even if you don't buy Crucial. That appears to be 1.5 volt DDR 3 PC-3 10600, unbuffered, non-ECC. It has to be laptop RAM. Not sure, but I think that may be 204 pin rather than the 240 pin used in desktops.

I don't know what you do with your laptop, but there is a pretty good chance you would never notice the difference between 4 gigs and 6 gigs of RAM. So, you might save the $25 for some other purpose and just buy 2 more gigs.

jaypels · 05 Feb 2011

I use this laptop for moderate Photoshop and CorelDraw usage and from time to time, capture and edit videos. I just came back from an Acer service center and they said the laptop only has two slots. I cannot open the laptop as of now because it is still on warranty so if i would buy the RAM, I would let them install it. I tried searching for shops that are selling computer parts and accessories here and found that they only sell 2gb and 1gb RAM because the demand is not high (if there is any) for higher RAM that is why I resulted to online shops.

I might as well go with Crucial (their website is easy to understand as compared to Kingston and Corsair's). Based on the snips I provided above, which of those two 4gb should I choose? I believe that brand would not matter as long as RAM timing and speed are the same. Am I correct with that? I would also talk to their customer representative first before purchasing to make sure both RAMs are compatible.

ignatzatsonic · 05 Feb 2011

It appears your existing RAM is DDR3-1066 (2 x 532.2), so I would buy CT1315536, which is also DDR3-1066. If you bought CT1315539, I suspect it would run at DDR3-1066 anyway. But either would work fine if you can rely on the Crucial configurator and you entered the right model number for your laptop.

If Acer service is going to install it, they certainly should be able to confirm which RAM is compatible.

jaypels · 05 Feb 2011

Thank for the recommendation. How about the dual channel stuff? Since this laptop supports dual channel, I would like both RAMs to be compatible in order to benefit from dual channel.

Phone Man · 05 Feb 2011

Your current ram is DDR3-1066 CL7 so go with the first one on the list as it has the same specs. You may want to look at CPU-Z and run it and look at the Memory and SPD tabs.

CPUID - System & hardware benchmark, monitoring, reporting

Jim

ignatzatsonic · 05 Feb 2011

Dual channel is a function of the motherboard. If you populate 2 slots, they should run in dual channel. Speccy says you are in single channel now because you have only a single stick.

But you are contemplating 1 2 gig stick and 1 4 gig stick---different sizes.

That might make a difference and might force you into single channel.

I'm not sure. I would confirm this with Acer. You need to know if dual channel would still be supported if you had 2 gigs in 1 slot and 4 gigs in another.

If it would force you into single channel, then you have to decide which is better:

2 gigs in each slot, dual channel

2 gigs in 1 slot and 4 gigs in the other, single channel.

To the extent you would actually use the 5th and 6th gig of RAM, the latter choice is preferable.

To the extent you wouldn't use the 5th and 6th gig of RAM, the former would be the better choice because of dual channel, but I'm not at all sure how much of a real-world difference it would make.

Talk to Acer about the 4 gig/6 gig single/dual distinction.

Confirm to your own satisfaction how much you would actually use the 5th and 6th gig.

Make your decision accordingly.

jaypels · 05 Feb 2011

For the following questions, let us assume that 2 x 2gb RAM would support dual channel while 1 x 2gb and 1 x 4gb would not support dual channel.

Is there really a significant difference in speed between a single and dual channeled RAM? If the difference is not noticeable, I think I would go for the 1 2gb and 1 4gb. But if the 2 x 2gb RAMs would be dual channeled and would have performance gain similar or almost similar to the first mentioned configuration, I would then buy the 2gb RAM instead. I would not mention getting 2 4gb sticks because as of now, I would not want to waste my existing RAM and second, it would be overkill for my usage right now.