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Help with RAM

post #1 of 11
Thread Starter 
Hello, I am in the process of building a new rig and need your help. When it comes to RAM i already own Corsair vengeance CMZ8GX3M2A16009B (2x4GB). I want to add 8 more Gbs to my new build. On amazon I found the same model but it says Designed for Sandy Bridge Platform and AMD Platforms. I will be keeping my I5 3570k ivy bridge CPU for my next build. So my question is have i been using the wrong ram with my current ivy bridge or is this not a issue to buy 8 more gbs and save money for my next build?

http://www.amazon.com/dp/B004QBUL1C/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2QFP19QZ4AGCA&coliid=I13DETLGUOTNW4
post #2 of 11
All of the memory you're going to istall in your computer (ie. 16 gigs) should be purchased as a mached 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) 
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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 
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post #3 of 11
Thread Starter 
Even if they are the same model number?
post #4 of 11
Just sharing my personal experience, I bought the exact same memory as you when I built my PC and realized the heat spreader wouldnt fit under my cooler. RAM at the time was half the price it is now so I just bought another 2x4 kit of the low profile which I read is identical apart from the heat spreaders.

I did have a problem: XMP profile affected the VID for my CPU pushing it up a bit but it didnt affect the actual CPU voltage required to be stable just meant I had to use a larger offset. Inputting the RAM timings and speed manually fixed this.

Anyway whether that was related to the unmatched kit I wouldn't know exactly, but I can say that I have been running with zero problems since November 2012 with these two kits smile.gif
post #5 of 11
Quote:
Originally Posted by Dm09 View Post

Even if they are the same model number?

Even if they are the same model number purchased at the same store on the same day!

The short version:
Memory manufacturers frequently change the ICs (the little black squares on the modules) that they use for a particular model No..
The published specs (timings) may be the same, but there are mamy, many more timings that are not published.
When a computer starts up it reads the appropriate SPD table (you can see a partial SPD table in the CPU-Z SPD tab) from the memory stick closest to the memory controller and uses that to set all the timings for all the sticks. The problem is that the timings that work for one set of memory may not work for the other.

You could manually set all the timings if you could see them, but you can't. It takes some pretty sophisticated software to extract a complete SPD table.
And even if you have the SPD tables for all the sticks, you would have to use the timings for the slowest sticks for all the sticks.

Corsair, for one, does a prretty good job of identifying IC changes (with Revision Numbers) for consumers.
The problem is that all manufacturers that I know of put rev nos on the sticks thenselves, not on the retail packaging where you can see it before you buy.
And no retailers will tell you the rev no before you buy.
Edited by billbartuska - 1/16/14 at 5:17am
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  
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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  
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post #6 of 11
Thread Starter 
Damn I was hoping to save 90 bucks in the process and that 8 gbs corsair I have is only 9 months old.
post #7 of 11
Quote:
Originally Posted by billbartuska View Post

Even if they are the same model number purchased at the same store on the same day!

The short version:
Memory manufacturers frequently change the ICs (the little black squares on the modules) that they use for a particular model No..
The published specs (timings) may be the same, but there are mamy, many more timings that are not published.
When a computer starts up it reads the appropriate SPD table (you can see a partial SPD table in the CPU-Z SPD tab) from the memory stick closest to the memory controller and uses that to set all the timings for all the sticks. The problem is that the timings that work for one set of memory may not work for the other.

You could manually set all the timings if you could see them, but you can't. It takes some pretty sophisticated software to extract a complete SPD table.
And even if you have the SPD tables for all the sticks, you would have to use the timings for the slowest sticks for all the sticks.

Corsair, for one, does a prretty good job of identifying IC changes (with Revision Numbers) for consumers.
The problem is that all manufacturers that I know of put rev nos on the sticks thenselves, not on the retail packaging where you can see it before you buy.
And no retailers will tell you the rev no before you buy.

Always learning, thanks for the info smile.gif
post #8 of 11
I bought 2 packs of these corsair 2 x 4GB ram sticks (but in black) put them in the same system and they work fine together I wouldnt worry and would just buy another pack, it would be very unlikely to do your system any harm!
post #9 of 11
Thread Starter 
I have heard both side from people on the net and at work... I guess I should buy 16gb kit and play it safe
post #10 of 11
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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