CPU-Z validation questions.

[kageryu]

So, I recently built my first computer and I have a couple of questions. I used the G skill ECO series 1600 MHz 8-8-8-24 for my build. After I validated using CPU-Z, here's what I got:

CPU Arch : 1 CPU - 4 Cores - 4 Threads
CPU PSN : AMD Phenom II X4 955 Processor
CPU EXT : MMX(+), 3DNow!(+), SSE (1, 2, 3, 4A), x86-64, AMD-V
CPUID : F.4.3 / Extended : 10.4
CPU Cache : L1 : 4 x 64 / 4 x 64 KB - L2 : 4 x 512 KB
CPU Cache : L3 : 6144 KB
Core : Deneb (45 nm) / Stepping : RB-C3
Freq : 3210.75 MHz (200.67 * 16)
MB Brand : Asus
MB Model : M4A87TD/USB3
NB : ATI 870 rev 00
SB : AMD SB850 rev 40
GPU Type : NVIDIA GeForce GTX 460
GPU Clocks : Core 715 MHz / RAM 1800 MHz
DirectX Version : 11.0
RAM : 4096 MB DDR3 Dual Channel
RAM Speed : 802.7 MHz (1:4) @ 8-8-8-24
Slot 1 : 2048MB (10700)
Slot 1 Manufacturer : G.Skill
Slot 2 : 2048MB (10700)
Slot 2 Manufacturer : G.Skill

Why is my RAM speed only showing "RAM Speed : 802.7 MHz (1:4) @ 8-8-8-24" when it should be 1600 MHz? Also, what is the significance of the "(1:4)"? Thanks in advance for your help.

 

[rolli59]

Double Data Rate 800MHz effective 1600MHz.

 

[kageryu]

Great but what does that "(1:4)" ratio mean?

 

[rolli59]

Borrowed this from Wikipedia "With data being transferred 64 bits at a time per memory module, DDR3 SDRAM gives a transfer rate of (memory clock rate) × 4 (for bus clock multiplier) × 2 (for data rate) × 64 (number of bits transferred) / 8 (number of bits/byte). Thus with a memory clock frequency of 100 MHz, DDR3 SDRAM gives a maximum transfer rate of 6400 MB/s."
Bus clock multiplier. Link to article http://en.wikipedia.org/wiki/DDR3_SDRAM