How reliable is SPD?

When I installed my memory into my motherboard (specs in signature), the default (AUTO) multiplier and timings were below the specifications of the memory. I can't run the memory at full speed due to stability issues which I'm investigating, but I want to ask how reliable SPD information is, because this what is displayed for my 8-8-8-24 modules.

[cpp]
CPU Host Clock Control [Auto]
CPU Frequency(MHz) 200
Set Memory Clock [Manual]
Memory Clock [x6.66] 1333Mhz
DRAM Configuration [Press Enter]
DCTs Mode [Unganged]
DDR3 Timing Items [Auto] SPD Auto
CAS# latency [Auto] 7T 9T
RAS to CAS R/W Delay [Auto] 7T 9T
Row Precharge Time [Auto] 7T 9T
Minimum RAS Active Time [Auto] 30T 30T
1T/2T Command Timing [Auto] -- --
TwTr Command Delay [Auto] 4T 5T
Trfc0 for DIMM1 [Auto] 110ms 110ms
Trfc0 for DIMM2 [Auto] -- --
Trfc0 for DIMM3 [Auto] 110ms 110ms
Trfc0 for DIMM4 [Auto] -- --
Write Recovery Time [Auto] 8T 10T
Precharge Time [Auto] 4T 5T
Row Cycle Time [Auto] 27T 33T
RAS to RAS Delay [Auto] 4T 5T

also

DRAM Voltage Control [1.650V][/cpp]


Of course when I run the memory at full speed with the timings in the SPD column, the motherboard refuses to use the settings "due to overclocking" and reverts to 1066 MHz. Thus, if I try to run at full speed with 8-8-8-24, and the SPD settings for precharge time and row cycle time, can I also expect errors? Is the SPD column twaddle?
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  1. Why can't I edit my post? I don't want people to miss the paragraph which was accidentally subsumed into line 28!
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