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RAM compatibility question

post #1 of 6
Thread Starter 
Currently I have 2 sticks of 2GB each from Corsair (XMS3). It's a DDR3 1600mhz, Timing is rated at 9-9-9-24, Cas Latency 9, and 1.65V voltage.
I'm thinking about adding 2 more sticks to my rig. It's not exactly the same model but they got pretty much the same specs except the voltage. It's 1.5V instead of 1.65V.

Should I expect any compatibility problems?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k gigabyte ga-p67a-ud4-b3 2X Sapphire HD 6850 CFX Corsair XMS 3 4GB 1600mhz 
Hard DriveOSMonitorPower
WD 1TB Caviar Black Windows 7 ultimate 64 bit samsung rz2233 Chieftech Nitro 750w 
CaseMouse
Thermaltake V9 Blackx Logitech G500 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k gigabyte ga-p67a-ud4-b3 2X Sapphire HD 6850 CFX Corsair XMS 3 4GB 1600mhz 
Hard DriveOSMonitorPower
WD 1TB Caviar Black Windows 7 ultimate 64 bit samsung rz2233 Chieftech Nitro 750w 
CaseMouse
Thermaltake V9 Blackx Logitech G500 
  hide details  
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post #2 of 6
Quote:
Originally Posted by CaLPaR View Post

Should I expect any compatibility problems?

You should anticipate problems whenever you use memory that was not all purchased together as a "Matched set" .
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) 
MouseAudio
Logiteck G400s none 
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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) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
post #3 of 6
Thread Starter 
Ok, but if I ware to choose another model that has exactly the same specs: same speed, same timings, same voltage etc, would there be any reason for them not to work together?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k gigabyte ga-p67a-ud4-b3 2X Sapphire HD 6850 CFX Corsair XMS 3 4GB 1600mhz 
Hard DriveOSMonitorPower
WD 1TB Caviar Black Windows 7 ultimate 64 bit samsung rz2233 Chieftech Nitro 750w 
CaseMouse
Thermaltake V9 Blackx Logitech G500 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k gigabyte ga-p67a-ud4-b3 2X Sapphire HD 6850 CFX Corsair XMS 3 4GB 1600mhz 
Hard DriveOSMonitorPower
WD 1TB Caviar Black Windows 7 ultimate 64 bit samsung rz2233 Chieftech Nitro 750w 
CaseMouse
Thermaltake V9 Blackx Logitech G500 
  hide details  
Reply
post #4 of 6
Here's a good read regarding your question : http://www.tomshardware.co.uk/answers/id-1854005/4gb-8gb.html
post #5 of 6
Thread Starter 
Thanks. I'll probably just stick with the RAM I have right now.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k gigabyte ga-p67a-ud4-b3 2X Sapphire HD 6850 CFX Corsair XMS 3 4GB 1600mhz 
Hard DriveOSMonitorPower
WD 1TB Caviar Black Windows 7 ultimate 64 bit samsung rz2233 Chieftech Nitro 750w 
CaseMouse
Thermaltake V9 Blackx Logitech G500 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k gigabyte ga-p67a-ud4-b3 2X Sapphire HD 6850 CFX Corsair XMS 3 4GB 1600mhz 
Hard DriveOSMonitorPower
WD 1TB Caviar Black Windows 7 ultimate 64 bit samsung rz2233 Chieftech Nitro 750w 
CaseMouse
Thermaltake V9 Blackx Logitech G500 
  hide details  
Reply
post #6 of 6
Quote:
Originally Posted by CaLPaR View Post

Ok, but if I ware to choose another model that has exactly the same specs: same speed, same timings, same voltage etc, would there be any reason for them not to work together?

Manufacturers often change the ICs (the black squares) they use for a particular memory to save money.
Since they only publish partial specifications for memory, sticks with the new ICs may or may not be compatible with older sticks even if all the published specs are exactly the same. There are actually a lot more timing specs than the 4 that are usually listed.

Some manufacturers (Corsair, for one) will indicate a change in ICs by adding a Rev. No. (revision number) to the model number. Corsair's forum even has info on which ICs are used for every Rev. No. to help customers determine compatability.

The two sides to the coin are:
Mixed memory may not work.
Matched sets will always work.
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) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
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) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
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