Will old DDR3 1600Mhz ram run at slower speeds with Server CPU?

[casobs2]

So I picked up a new server and am gathering parts for upgrades.  It's old with 2x E5-2620 V1.  This processor only supports DDR3 800/1066/1333.  I have a buddy who has a bunch of Server ECC DDR3 but they are 1600Mhz.  They will work with the board if there were different CPUs in the sockets.  So my question, will they still work? Maybe not at 1600MHz, but will it dial the speed back to 1333?  Actually kind of of hard to find info on this.

 

Thanks ahead of time.

[IdiotMcGee]

It wont necessarily make your ram slower but you should go to your bios and lower your ram memory speed to 1333 just incase it goes wrong.

[svmlegacy]

Maybe. It will only work if it has a JEDEC profile for 1333.

 

I've never seen a stick of DDR3 that doesn't support 1333 (as long as it wasn't slower than that), so you'll most likely be okay.

[Electronics Wizardy]

It should work at lower speeds, but Id just try it here. 

 

What type of server ram? There is unbufffered ecc and registed dimms.

 

HOw many slots are you using? Most boards slow down if your using more dimms per channel.

[TukangUsapEmenq]

26 minutes ago, Electronics Wizardy said:

HOw many slots are you using? Most boards slow down if your using more dimms per channel.

Kind of lost here actually of 'boards slow down'. You meant as if using two DIMMs for dual-channel and the clock's cut by half on the module (which in the case, afaik, always like so), or... As it kind of 'really decreasing' the performance?

[Electronics Wizardy]

1 hour ago, TukangUsapEmenq said:

Kind of lost here actually of 'boards slow down'. You meant as if using two DIMMs for dual-channel and the clock's cut by half on the module (which in the case, afaik, always like so), or... As it kind of 'really decreasing' the performance?

This is dimms per channel, not number of channels. So with lga 2011 and 4 channels, many boards are 1333 max for 4 dimms/1 dimm per channel, 1066 max for 2 dimms per channel, or 8 dimms and 800 max for 3 dimms per channel or 12 dimms total.

 

Performance will go down if you use all the slots normally, but normally not having enough ram will have a much bigger performance hit than 1333 vs 800 mts.