PDA

View Full Version : Ram of different frequencies



bubble_boy
12-01-2012, 02:57 PM
Hey guys, I've just got my ASus g55v today. I've upgraded it to 8gb ram. What I just found out is that the 2nd stick of ram which was used was of different frequency. It was 4gb ram ddr3 1333hz. The one which came with the laptop was 1600hz. Will my laptop be fine? Or would it spoil it? If it does, i would then get a 4gb ram of same frequency.

HiVizMan
12-01-2012, 03:22 PM
Download and open CPUz

Navigate to the memory tab take note of what the frequency your system is running. If 1600Mhz it would be 800 in the little box.

Post up what your CPUz shows please.

rewben
12-01-2012, 03:51 PM
that probably will downclock the RAM to 1333Mhz. but not to worry, your machine is fine. previously my g55 ran nicely with 2x4 1600Mhz stock RAM and 2x4 1333Mhz (i should have come here for consultation first, instead of listening to the seller :/).

you can refer here (http://rog.asus.com/forum/showthread.php?23929-Adding-RAM-to-G75&p=168646&viewfull=1#post168646) for more information about compatible RAM for g55/g75.

bubble_boy
12-01-2012, 04:13 PM
14424
Download and open CPUz

Navigate to the memory tab take note of what the frequency your system is running. If 1600Mhz it would be 800 in the little box.

Post up what your CPUz shows please.
there. im worried about the fbs:dram ratio because most people say that it should be 1:1

Pandur
12-01-2012, 04:31 PM
That screen grab shows your ram running at 1333MHz and the fsb:dram ratio is fine. If you replace the 1333 stick with another 1600 your computer will run your memory at 1600 and the fsb:dram ratio will change accordingly.

Optional technical bit:
Intel Core i* cpus run at a low fsb so the fsb:dram ratio will always be more than 1:1. In your case it tells you that your computer is running the memory at 5xfsb which is 5x133 or 667MHz, add the fact that your memory is DDR and you get 1333MHz effectively. If you run 1600MHz memory you will have a fsb:dram ratio of 1:6.

rewben
12-01-2012, 04:44 PM
thanks @Pandur for the technical explanation!

@bubble_boy, please check your stock RAM for the right timings if you need a matching RAM. not all 1600Mhz are compatible with each others. for instance, corsair vengeance 1600Mhz 9-9-9-24 will still downclock your combination to 1333Mhz.

bubble_boy
12-01-2012, 11:50 PM
So basically my laptop will be fine?

Pandur
12-02-2012, 01:09 AM
Yes it should work just fine. Your computer has automatically picked the settings for the slower stick. If you want to make sure it's stable, run Memtest86+ to check.

The only thing you're missing out on is that the faster stick runs at the same speed as the slower one, and possible slower timings as well. In normal use this isn't something to worry about as long as it's running stable.

Unless you only live to compare benchmarking scores with your friends/total strangers on the internet. ;)

bubble_boy
12-02-2012, 05:07 AM
Yes it should work just fine. Your computer has automatically picked the settings for the slower stick. If you want to make sure it's stable, run Memtest86+ to check.

The only thing you're missing out on is that the faster stick runs at the same speed as the slower one, and possible slower timings as well. In normal use this isn't something to worry about as long as it's running stable.

Unless you only live to compare benchmarking scores with your friends/total strangers on the internet. ;)
Lol.. Not too concerned about that.. I'm afraid because heard from my friends that it can cause the BIOS to go crazy. Will it affect my gaming?