For which one should I go..

[Agera One]

This is what my official Sony website says about my RAM..

This is what my CPU-Z's Memory tab says..

Now my laptop's memory is really 1066 MHz or my laptop just uses 533 only?
I'm gonna upgrade, so what speed should I choose?

 

[byza]

It's DDR 3 or double data rate so the effective speed is 2x 532.1MHz or 1064.2MHz. Chances are that your laptop doesn't support faster than 1066 or 1333, so there isn't much reason to upgrade.

 

[Agera One]

It's DDR 3 or double data rate so the effective speed is 2x 532.1MHz or 1064.2MHz. Chances are that your laptop doesn't support faster than 1066 or 1333, so there isn't much reason to upgrade.

By upgrading, I meant more memory not speed.. I was on a doubt that I should get new sticks in the market with 533 MHz or 1066 MHz? CPU-Z shows half the rate and the product boxes those in the market suggests the full speed? For example, this RAM

 

[byza]

Your ram is running at full speed, with CPU-Z you need to double the DRAM Frequency to get the speed that your RAM is running at.

As for the RAM you selected, it will not fit in a laptop. Laptops use different size and shape memory sticks, which even differ between laptops. You would need to find out the size and shape memory that your laptop uses then search for that specific memory.

 

[Agera One]

Your ram is running at full speed, with CPU-Z you need to double the DRAM Frequency to get the speed that your RAM is running at.

Now I'm confused, how can I double the DRAM frequency using CPU-Z? Also, I gave that RAM (I found it is 1600 MHz from the model number) link just to ask whether the system with that RAM installed, will the CPU-Z on that system will show 800 MHz or 1600 MHz on the memory tab? (not for upgrading my laptop)..

 

[Tradesman1]

No, CPU-Z indicates the true freq the DRAM runs at (532.), that the actual freq of the DRAM....Now then, this is DDR (DOUBLE data rate) so it runs at DOUBLE the freq so 532 x 2 = 1064 effective - your DRAM is 1066 so you are basically right on target

 

[Agera One]

No, CPU-Z indicates the true freq the DRAM runs at (532.), that the actual freq of the DRAM....Now then, this is DDR (DOUBLE data rate) so it runs at DOUBLE the freq so 532 x 2 = 1064 effective - your DRAM is 1066 so you are basically right on target

Now I understand, can you please select a suitable laptop RAM from this website with the same speed and CAS Latency timings?

 

[Tradesman1]

What's the model of your laptop and how much DRAM are you looking for total (need the model number to see number of slots and capacities supported)

 

[Agera One]

I provided a photo above the CPU-Z photo.. Anyways.. It's a Sony Vaio E Series VPCEB34EN
I'm planing to leave the 2 GB stick as it as and replace the 1 GB stick with a 4 GB RAM.. Do you know how much speed my laptop can support?

 

[Tradesman1]

According to the spec sheet 1066

 

[byza]

You need to open your laptop and look at the RAM stick, it will hopefully have a PC number. I'm pretty sure it will be PC10600 but it's possible that it is PC10666 or even a different number. To ensure that you get the correct RAM, you need to know this number. Alternatively it should have a model number and it might be possible to find the PC number using that information.

 

[Tradesman1]

PC(3)10666 is 1333 DRAM he's running currently at 1066 which would be PC3 8500 if using that designation

 

[byza]

I've seen PC/3 (everywhere i've looked in Aus leaves off the 3 but to my understanding the 3 correlates to DDR3 RAM)designations 10600, 10666 and 12800 with 1333MHz advertised speed. I know the PC number has associations with speed, but to my understanding it also had something to do with compatibility?

 

[Tradesman1]

10600, 10666 correlates to 1333 (667 true freq) sticks as 8500 is to 1066 sticks (533 true freq), 12800 is to 1600 (800 true freq) sticks, 14900 is to 1866 (933 TF) sticks - all simply 2 different designators for a particular freq of sticks so for each there is true freq say 800, what it's considered 1600 (due to being DDR (DOUBLE data rate)) and then the 12800 which is the theoretical number of M/Ts (mega transfers per second (roughly MegaBytes)) it can handle in a single clock cycle Confused yet?

 

[byza]

Haha no I can follow. What confused me is when I was looking for RAM for my laptop, I saw 10600, 10666 and 12800 with an advertised speed of 1333MHz. I knew it had to do with speed, so I figured 10600 and 10666 were close enough, but when I saw 12800@1333MHz, I thought it must have been compatibility, in a similar way to how M.2 has different sizes and keys.

 

[Tradesman1]

The 12800@1333 is either a misprint, or someone is thinking 'use 1600 sticks and downclock to 1333', shouldn't be anything like that in an ad, DRAM is confusing enough to most people without throwing them more curves

 

[byza]

Yes, it's hard enough trying to understand frequency and CAS latency. The rest of the RAM timings just lose me.

 

[byza]

Back to the OP. Using my recently imparted knowledge, any of these RAMs should work, although none have the same timings.
http://www.flipkart.com/computers/computer-components/rams/pr?p%5B%5D=facets.capacity%255B%255D%3D4%2BGB&p%5B%5D=facets.device%255B%255D%3DLaptop&p%5B%5D=sort%3Dpopularity&sid=6bo%2Cg0i%2Cs5u&q=1333&otracker=start&ref=9c0c297e-d9e0-491a-ace7-20ac6700ab30

 

[Agera One]

Back to the OP. Using my recently imparted knowledge, any of these RAMs should work, although none have the same timings.
http://www.flipkart.com/computers/computer-components/rams/pr?p%5B%5D=facets.capacity%255B%255D%3D4%2BGB&p%5B%5D=facets.device%255B%255D%3DLaptop&p%5B%5D=sort%3Dpopularity&sid=6bo%2Cg0i%2Cs5u&q=1333&otracker=start&ref=9c0c297e-d9e0-491a-ace7-20ac6700ab30

You've searched for 1333MHz in that web link I provided, but 1066 is enough for me, right?

 

[byza]

Back to the OP. Using my recently imparted knowledge, any of these RAMs should work, although none have the same timings.
http://www.flipkart.com/computers/computer-components/rams/pr?p%5B%5D=facets.capacity%255B%255D%3D4%2BGB&p%5B%5D=facets.device%255B%255D%3DLaptop&p%5B%5D=sort%3Dpopularity&sid=6bo%2Cg0i%2Cs5u&q=1333&otracker=start&ref=9c0c297e-d9e0-491a-ace7-20ac6700ab30

You've searched for 1333MHz in that web link I provided, but 1066 is enough for me, right?

Yes, but the only RAM available is more expensive.
http://www.flipkart.com/computers/computer-components/rams/pr?p%5B%5D=facets.capacity%255B%255D%3D4%2BGB&p%5B%5D=facets.device%255B%255D%3DLaptop&layout=grid&p%5B%5D=sort%3Dpopularity&sid=6bo%2Cg0i%2Cs5u&otracker=start&q=1066

 

[Agera One]

Oh, yes, that's expensive.. I'll get a 1333 MHz stick and install.. i know it'll get underclocked, but no problems

 

[Agera One]

Or how bout this link? Another good online purchase site..
http://www.snapdeal.com/product/transcend-so-4gb-ddr3-ramjm1066ksn4g/545240
it has programmable CAS latency of 5,6,7,8.. So can i program it to 7-7-7-20?