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Corsair XMS 3 1600MHz best settings

post #1 of 4
Thread Starter 
Though there are better options available in our planet, they were outta my reach either because of unavailability or for unusually high price ( try 1.5 times that in USA/UK markets ). Due to some reason the reputed online shops dont deliver here either. So, last week I bought a pair of these.... XMS3 1600 cas9.
Now all I need to know is how far can I push these babes on my mobo and what timings can be used on these. Anyone here with enough experience on these modules please please please help me out.
I could experiment myself but dont wanna do it, cause if anything bad happens then i would have to go talk to those cockroaches (local vendors) again.
    
CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
Case
CM HAF932 (painted black) 
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CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
Case
CM HAF932 (painted black) 
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post #2 of 4
Looking at the spec sheet, yours are rated for 9-9-9-24 1.65V
I'm sure you've heard again and again how our Phenom ii x4 955's IMC favors tighter timings over higher clocks. They also struggle with anything over ~1668MHz+ especially if all DIMM slots are populated. So, it might be beneficial for you to lower their speed down some, try tighter timings and see if they are stable. I'm guessing they can probably do 8-8-8-24 1333-1564 or so @1.65V. You should also bump the NB speed (and voltage a bit if necessary) up some. The stock of 2GHz really holds back faster ram.

This was my experience:
I'm running the same set except mine are the 1333 cas8 version. With everything left at default mine ran at:
1333@1.5V
CL 9
tRCD 9
tRP 9
tRAS 24
tRC 34
CR 1T
Now those are the default settings for most motherboards (probably what yours run if you just stick them in and do nothing), and mine ran fine and stable at those settings. They scored a WEI of 7.6

I realized that the ram I chose was not the most overclock friendly, and probably wouldn't like going too high over 1333. So instead of overclocking with the ref clock I used the multiplier. My settings were:
Vcore: 1.48
Multi: x19.5 (3.9GHz)
Ref clock: 200 (if you bump this up it will increase your ram, nb and ht link speeds)
NB Multi: x12 (2.4GHz)
CPU/NB: 1.2V
I left HT alone
I tightened ram timings to 8-8-8-24-34-1T
This increased my WEI ram score to 7.8!

In the Phenom II x4 955 benchmarks I've read 1333 performs nearly identical to 1600+, while 1066 is a big decrease in performance from both. That's why I think you're best off setting them to 1333 with 8-8-8-24 timings. Overclock the ref clock some and your ram will be bumped up with it. If that isn't stable then try just using the stock 9-9-9-24@1600 settings. Compare the two, see which gives you more performance.
Remember to use 1.65V for your ram otherwise they are more likely to be unstable.
Also don't forget to bump up NB speed and Voltage a little bit. These threads should help you with some good settings:
http://www.overclock.net/amd-cpus/49...x4-9x5-oc.html
http://www.overclock.net/amd-cpus/50...-oc-550-a.html
Edited by FDS - 12/29/10 at 2:05pm
post #3 of 4
That's actually wrong in some areas; 1333 is not identical in performance to 1600+, in fact anything below 1600Mhz really doesn't scale well on AMD (i.e. 1600 CAS9 = 1333 CAS7, but using the same CAS9/7 latencies with higher speeds, 2000 CAS9 = 1600 CAS7 (a bigger 400Mhz gap). 1066 CAS7 and 1333 CAS9 (both generic settings) are about equal. 1333 8-8-8 is a ripoff.
post #4 of 4
Thread Starter 
Hmmm.... I think I have to leave these as they are cause its highly unlikely that i can lower the cas to 7 at 1333.
@FDS -- Like any other am3 board i have seen, this one didnt take the ram well either. had to go to bios and feed the correct timings. but in the hurry i forgot to change the cycle time from 1 to 2T. Everything was running fine until i started prime95 and everytime one of the threads stopped with error 1002. immediately corrected the bios setting and now all is well. Dont think that this memory has much tolerance.
    
CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
Case
CM HAF932 (painted black) 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom II X4 955BE ASUS M4A88TD-V-EVO/USB3 MSI GTX 560Ti TwinFROZR II OC Corsair XMS3 2x2GB 1600MHz C9 
Hard DriveOSMonitorPower
2x500GB Seagate Windows 7 Ultimate 32bit Samsung 20" B2030 Corsair TX650 V2 
Case
CM HAF932 (painted black) 
  hide details  
Reply
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