Member Avatar for NoCodeMonkey

This is what I want to buy:

but im confused about something :/

it says on the title that its 1066MHz, is that both RAM cards together? or each is 1066MHz?

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Short answer for : that listing’s "1066MHz" is the per‑module effective transfer rate (DDR3‑1066 / PC3‑8500). In a 2×4GB kit each stick is rated at 1066 MT/s — you do not add two 533MHz clocks to get 1066. The reason people sometimes say "533MHz" is that DDR memory transfers data on both clock edges (so 533 MHz physical clock ×2 = 1066 MT/s). (en.wikipedia.org)

What to check before buying (builds on points from , and ): make sure the part is a SO‑DIMM (laptop form factor) and that the module voltage (DDR3 vs DDR3L) matches what your laptop supports — many DDR3L sticks are dual‑voltage but will run at 1.5V if the system supplies it. It’s best to buy a matched kit (2×4GB) rather than two random modules because kits are validated to work together; use a compatibility tool (Crucial System Scanner / Advisor or the maker’s configurator) to confirm the exact part. (kingston.com)

Quick compatibility checklist and tips (practical):

  • Confirm your laptop takes SODIMM DDR3 and the maximum per‑slot and total capacity.
  • Verify module voltage (1.35V vs 1.5V) on the existing stick label or vendor page.
  • If you mix different speeds, expect the memory to run at the slowest supported speed (or at the CPU/motherboard limit); matched kits avoid this and reduce instability.
  • Install with power removed, use anti‑static precautions, seat modules in correct slots, then check reported speed in BIOS/UEFI or with a utility like CPU‑Z.

If anything looks off, the vendor configurator and kit warranties (and returns) make troubleshooting or exchange straightforward. (crucial.com)

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Member Avatar for Begginnerdev

1066Mhz is the speed that ram will send/receive data.

The kit that you are looking at is an 8gb kit. (8192mb kit)

This is the amount that will be added to your memory bank.

Member Avatar for dom246

So, to add to Begginnerdev's point, different motherboards work with memory at different speeds. So, you will want to make sure that the memory you are buying is compatible with your particular motherboard. Crucial has an awesome memory scanner that I would recommend checking out if you are unsure. You can also just check the specs on your particular motherboard.

Member Avatar for NoCodeMonkey

Im asking is each ram in the kit 533MHz to = 1066 or are they both 1066MHZ?

Member Avatar for dom246

Both are 1066.

Member Avatar for Greg_z

Your best thing to do, is to use Crucial.com advisor, and it will tell you the correct RAM for your machine. Then shop around. I will tell you up front, that RAM prices have gone up. No matter where you shop, all are going to be around the same price.

At least with Crucial, it is a no hassle return if they send the wrong kind, or it goes bad at any time. I only purchase all my SSD's and RAM through them and no one else.

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