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RAM question- not sure how to word it

post #1 of 5
Thread Starter 
Hello all, I come today with a question I haven't ever wondered before.

I bought this set of RAM this past January for a build for my grandpa. I have since realized he certainly doesn't need 8 GB of RAM, even for the BF3 and other games he plays. I also just ordered a slew of new parts yesterday for another build (including an i3-3220 and an HD 7790), just to keep around in my room for if a friend comes over and wants to play/to take to LAN parties. I didn't buy any RAM because I figured I could just take out one stick of the Kingston RAM to make us both have 4 GB. Then I went into CPU-z and the RAM in his computer is listed at 800 MHz with just the one stick in.

Now my question is, will both sticks-when run independently- be at 800 MHz? Do they have to be working together for the 1600 MHz to be achieved? If that's the case, I may consider buying some RAM for this new computer.

Thank you!
post #2 of 5

DDR stands for Double Data Rate - try it with both sticks in and CPU-Z will still show 800 MHz but it is really running at 1600 MHz per clock cycle. I'd ask your grandpa if he's okay with it/to test it for some time - from what I know AMD systems are less affected in performance by running RAM in single channel mode with a single stick compared to Intel.


Edited by Sainesk - 6/23/13 at 11:28am
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by Sainesk View Post

DDR stands for Double Data Rate - try it with both sticks in and CPU-Z will still show 800 MHz but it is really running at 1600 MHz per clock cycle. I'd ask your grandpa if he's okay with it/to test it for some time - from what I know AMD systems are less affected in performance by running in single channel mode with a single stick compared to Intel.

Yeah, I'd played a few rounds of BF3, watched some YouTube, streamed video and unzipping some files and everything and I can't really tell a difference between before and now. But it is running at 800 MHz with just the one stick? Sorry for all the questions, I'm not too up to speed with RAM workings.
post #4 of 5
Good on grandpa - leave the 8 there, BF4 might be more demanding thumb.gif
post #5 of 5
Quote:
Originally Posted by buffsportsman View Post


Yeah, I'd played a few rounds of BF3, watched some YouTube, streamed video and unzipping some files and everything and I can't really tell a difference between before and now. But it is running at 800 MHz with just the one stick? Sorry for all the questions, I'm not too up to speed with RAM workings.


It is running at 800MHz x 2 since it is DDR where Data Transfer happens twice per clock cycle, so it is running at 1600MHz. Having two sticks instead of one would only change being able to use dual-channel mode, which allows the memory controller to access each stick separately (increasing bandwidth) - from tests i've seen it's about a 5% difference in performance when we compare using 2x2GB versus 1x4GB (5% worse performance).

 

Think of it like this:

 

where SDR is Incredible Hulk and DDR is Flash and tons is frequency:

 

Hulk is moving 10 tons of weight into a van per second

Flash is moving 5 tons of weight into a van every half of a second

 

over say 10 seconds how much did they each move? both moved 100 tons

 

and Dual Channel is like:

 

having 2 x Flash

Flash 1 (representing single channel) has a van that can hold 95 tons of weight and has to wait for the next van to come before sending more

Flash 2 (representing dual channel) has two vans that can hold 50 tons of weight each

 

if vans come and go at the same speed then Flash 2 will move more tons faster because he can fit more tons at a time into his vans.


Edited by Sainesk - 6/23/13 at 12:21pm
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