7 Plutonium

RE: Optiplex 990 supported memory speed

Dell has not and will not validate speeds that did not exist at the time of  manufacture.  7 7 7 and 8 8 8 are not available in all timings all versions all speeds.  There is no one size fits all.  The ram in question is getting harder to find because its not manufactured for 5 years or more now.  The other issue is 1.35v or 1.5v is max for this chipset.

There are however 1.8v to 2.0v modules that would not be compatible.

The Optiplex  DOES NOT support BUFFERED, REGISTERED, ECC ram which has nothing to do with speed as they can have this at all speeds.

Standard name
 
Module name
 
Peak transfer rate
(MB/s)
Timings
(CL-tRCD-tRP)
CAS latency
(ns)
DDR3-800D
DDR3-800E
PC3-6400 6400 5-5-5
6-6-6
12.5
15
DDR3-1066E
DDR3-1066F
DDR3-1066G
PC3-8500 8533.33 6-6-6
7-7-7
8-8-8
11.25
13.125
15
DDR3-1333F
DDR3-1333G
DDR3-1333H
DDR3-1333J
PC3-10600 10666.67 7-7-7
8-8-8
9-9-9
10-10-10
10.5
12
13.5
15
DDR3-1600G
DDR3-1600H
DDR3-1600J
DDR3-1600K
PC3-12800 12800 8-8-8
9-9-9
10-10-10
11-11-11
10
11.25
12.5
13.75
DDR3-1866J
DDR3-1866K
DDR3-1866L
DDR3-1866M
PC3-14900 14933.33 10-10-10
11-11-11
12-12-12
13-13-13
10.56
11.786
12.857
13.929
DDR3-2133K
DDR3-2133L
DDR3-2133M
DDR3-2133N
PC3-17000 17066.67 11-11-11
12-12-12
13-13-13
14-14-14
10.313
11.25 
12.188
13.125 

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