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Asus P5Q not recognizing 1066MHz

Last response: in Memory
a b } Memory
October 20, 2010 3:04:53 PM

Asus P5Q
E8400 Core2Duo 3,0 Ghz
Patriot Viper Kit 2x2GB 1066Mhz RAM (PVS24G8500ELKR2)

On auto settings it only detects 400MHz of memory

After setting everything manually 5-5-5-15 2,1V it detects 534Mhz

I have no clue what the problem is.
a c 347 } Memory
a c 207 Ĉ ASUS
October 21, 2010 12:46:30 AM

There are several ASUS P5Q models -

If you are reading the speed from CPUz then remember DDR {Double Data Rate}; if CPUz shows 534X2 = 1068. However, 400MHz is 'generaly' the FSB Strap to Northbridge vs the DRAM Frequency; set the FSB to {Auto} & DRAM Frequency from {Auto} to {DDR2-1066 MHz}.

Example 533 X 2 = 1066 MHz RAM; CM3X2G1600C9DHX is rated for 1600 MHz, but by default it is running at 1066 MHz in this example.

First, Patriot is very problematic and I would strongly recommend that you use Patriot's configuration tools -

Tested RAM P5Q -
List of Tested RAM:
PSD22G800KH 6400 2 GB PDF

PSD22G800KH 6400 2 GB PDF
PSD22G8002H PC2-6400 (800MHz) 2 GB PDF
PSD22G800K-I PC2-6400 (800MHz) 2 GB PDF
PSD21G8002H PC2-6400 (800MHz) 1 GB PDF
PSD21G8002-I PC2-6400 (800MHz) 1 GB PDF
PSD24G667KH PC2-5300 (667MHz) 4 GB PDF
PSD22G667KH 5300 2 GB PDF
PSD21G6672H PC2-5300 (667MHz) 1 GB PDF
PSD21G66781H PC2-5300 (667MHz) 1 GB PDF
PSD22G6672H PC2-5300 2 GB PDF

Crucial Info -
a b } Memory
a b Ĉ ASUS
October 21, 2010 3:41:19 PM

When you are running at stock settings, the BIOS will read the contents of the SPD chip on the RAM sticks and use that data to automatically configure the memory.

The SPD chip is programmed during production. If the SPD chip is telling you that you have DDR2-800 RAM, but the package is telling you that you have DDR2-1066 RAM, what you have is factory overclocked RAM that has been tested to run at the higher speed, generally with a higher voltage and looser timings.
a c 347 } Memory
a c 207 Ĉ ASUS
October 21, 2010 3:52:59 PM

^True IF ALL of the RAM is identical, but setting it takes the guess work out; I too 'personally' never use XMP nor Auto settings for RAM.