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Can someone tell me the difference between...

post #1 of 5
Thread Starter 
Hi all, this is my first thread and I am fairly new to overclocking. While researching my hardware, I noticed that the G-Skill DDR3 2133 memory that I bought, two separate times, are different in name. Both were purchased as 2x4GB sets. My question is, what is the difference between fx-17000cl11-4gbxl and fx-2133c9-4gxl. Are these just lot numbers or do the sticks have different settings and thus different performance? Is the best install as slot 1-3 and 2-4? Again, I have 2 of each for a total of 16GB. Thanks
post #2 of 5
I'll try and explain what you have, but first please post screen shots of of CPU-Z's Memory tab and the SPD tab for both memories. That will show the differences between the two types of memory you have. You, being able to see those screen shots will help you understand what I'm going to tell you. It's kind of complicated and those will greatly help you understand.

Like this:



When purchasing memory, you should buy all the memory you're going to put into your computer as one matched set. Mixing memory sometimes works, as it seems to be for you, but sometimes it doesn't, or sometimes the memory will work but won't run like it is supposed to run..
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My System
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CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
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Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
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2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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post #3 of 5
Thread Starter 
Hi Bill, thanks for responding to my question. When I bought these, I figured 8GB was enough but then I got greedy and thought 16... why not?
I presumed that they would be the same if both were DDR2133. Did not count on the intricacies that come with RAM. Anyway, this is what I have:




Slots 1 and 2 are the same as are 3 and 4. Looks like the timing are a bit different.

I overclocked them along with my CPU using the ASUS AI Suite.
Edited by Myplane150 - 2/29/16 at 9:18pm
post #4 of 5
WOW, that's some weird Gobbledy gook there. Let's see if we can make any sense of it.

first off, don't use any overclocking programs (ie. ASUS AI Suite). Those programs change a whole bunch of stuff all at once. They are also "one size fits all" attempts at overclocking. The engineer that wrote them was trying to apply the settings the would work on the widest range of components. He had no idea what specific components you were going to be installing.And another problem is that if you push your overclock to far and you get a failure you're stuck because you don't know which BIOS setting caused the failure. All the same is true for XMP Profiles. Automatic overclocking AI SUite and XMP) are like a TV dinner vs a home cooked meal!.

With most mother boards a matching set go in slots 1 and 3 and the other matching set in slots 2 and 4. Your Owners Manual will tell you what ti do.

Memory timings:
Timings are just that, lengths of time. They are the length of time that the computer has to wait for the memory to complete that particular step of what it has to do before the memory can move on to the next step. Except, instead of hours/minutes/seconds, the length of time are "clock ticks". Memory running at 800 MHz has a clock that ticks 800,000,000 (eight hundred million) times per second. A "timing" of 11 means the memory has to wait eleven eight hundred millionths of a second. for that step. It doesn't matter at what speed the memory is running.It always takes eleven eight hundred millionths of a second. . So if you overclock 800 MHZ memory to 1,000 MHZ then 8/800,000,000ths of a second will take 15.125 clock ticks - 8 times 1,000,000,000 divided by 800,000,000 (actually 16 clock ticks because clock ticks can't be "split".)



Now for 1T vs 2T:
Note that in the picture above everything is happening at a voltage "uptick", That's 2T - two voltage changes (one up and one down) for something to happen. With a setting of 1T reads and writes can happen on either an uptick or a down tick. That results in the possibility of the computer having to wait one half of a clock tick less for the memory to get to that next step.

And a little more about overclocking:
What CPU-Z is showing is only 5 timings and one setting (Command rate). There are actually over 20 different timings and settings for all memory, some of which you can't even see withour special programs. You can have a look at Thaiphoon Burner. Just follow the directions carefully because this program can and will rewrite the SPD tables programmed int the memory sticks - look, but don't change!

Back to your original question:
So now when you look at those CPU-Z screens you can see how goofy those XMP profiles are.

And a little hint:
If you're a serious overclocker, 6 months to a year from now knowing that tREF and Maximum Asynchronous Latency are the keys to memory stability may help you out. But you have a long way to go before you get there!

It will take some thinking and pushing the buttons on a calculator, but I hope all this helps you at least a little bit.....................
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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Logiteck G400s none 
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post #5 of 5
Thread Starter 
Thanks for all the info, Bill. Seems I've got a bunch to learn. Thanks again.
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