8Gb 1333 CL9 on P67A-UD5 Suggestions

While I agree with the QVL, it is NOT the De facto choice. The P55 chipset {i5} RAM will work on the P67, and yes I prefer either Certified {QVL} or RAM Mfg Tested. Most always I go the Test or Approved route with RAM. If I see RAM that I like and it's NOT QVL or Tested then a simple ticket to the RAM Mfg is advisable. The advantages of higher speeds are NOT that much, and the performance differences between 1333 MHz and 1600 MHz might be 1~3%; it's all about the quality of the RAM IC.

Example:
7-7-7-21-2N 1333 (F3-10666CL7D-8GBRH) #1
7-8-7-24-2N 1600 (F3-12800CL7D-8GBRH) #2
9-9-9-24-2N 1600 (F3-12800CL9S-8GBRL) #3

#2 - I do not like RAM with CAS disparity to achieve a 'CAS Rating' ; of the disparity makes the RAM slower than 1~2 CAS slower but tight CAS RAM.

#1 vs #3 The CAS vs Rated Speed may make them the same or even the 1600 MHz slower.

For comparison of CAS vs Speed vs the biggie IC:

Comparison Module #1: Mushkin Redline 996805 6-8-6-24 1600MHz
Comparison Module #2: G.Skill Pi Series 7-8-7-24 1600MHz
Comparison Module #3: Mushkin 998687 8-9-8-24 1866MHz
Comparison Module #4: Corsair Dominator TR3X6G1600C8D 8-8-8-24 1600MHz
Comparison Module #5: Kingston HyperX T1 9-9-9-27 1600MHz
Comparison Module #6: Mushkin Blackline 998677B 7-7-7-20 1333MHz
Comparison Module #7: Patriot Viper II Sector 7 9-9-9-27 1800MHz

Running same 1800 MHz:

Stock Speed + CAS:

I'm already Gold and broke the forum counter, won't do me any good but thanks.
http://www.tomshardware.com/forum/profile-388864.htm {see Gold/bug in the forum}.

Nope, NONE of the list above that you provided were Ripjaws X and all the part numbers will be F3-#..1#-#GBX# ; http://www.newegg.com/Product/Prod [...] ageSize=20

7-7-7-21-2N 1333 (F3-10666CL7D-8GBRH) -> http://www.gskill.com/products.php?index=322
7-8-7-24-2N 1600 (F3-12800CL7D-8GBRH) -> http://www.gskill.com/products.php?index=317
9-9-9-24-2N 1600 (F3-12800CL9S-8GBRL) -> ??typo

Good Luck!

So basically I clearly miss understood the writings below. Would you mind to explain what the 1333 stands for (bold). Thank you..

System Memory Support
• Two channels of unbuffered DDR3 memory with a maximum of two UDIMMs or SODIMMs (for AIO) per channel
• Single-channel and dual-channel memory organization modes
• Data burst length of eight for all memory organization modes
• Memory DDR3 data transfer rates of 1066 MT/s and 1333 MT/s
• 64-bit wide channels
• DDR3 I/O Voltage of 1.5 V
• The type of memory supported by the processor is dependent on the PCH SKU in
the target platform
— Desktop PCH platforms support non-ECC un-buffered DIMMs only
— All In One platforms (AIO) support SO-DIMMs
• Maximum memory bandwidth of 10.6 GB/s in single-channel mode or 21 GB/s in
dual-channel mode assuming DDR3 1333 MT/s
• 1Gb, 2Gb, and 4Gb DDR3 DRAM technologies are supported
— Using 4Gb device technologies, the largest memory capacity possible is 32 GB,
assuming Dual Channel Mode with four x8 dual ranked unbuffered DIMM
memory configuration.Introduction
12 Datasheet, Volume 1
• Up to 64 simultaneous open pages, 32 per channel (assuming 8 ranks of 8 bank
devices)
• Command launch modes of 1n/2n
• On-Die Termination (ODT)
• Asynchronous ODT
• Intel® Fast Memory Access (Intel® FMA)
— Just-in-Time Command Scheduling
— Command Overlap
— Out-of-Order Scheduling

===

It supports a maximum of two DDR3 DIMMs per-channel; thus, allowing up to four
device ranks per-channel.
• DDR3 Data Transfer Rates
— 1066 MT/s (PC3-8500), 1333 MT/s (PC3-10600)

===

Hm. Thank you. I will try to make it up then

The F3-10666CL7D-8GBRH is a DDR3-1333 7-7-7-21-2N kit; note the DDR3-1333 CAS 7 benchmarks any variation because of IC quality will be minimal; see -> http://www.bit-tech.net/hardware/m [...] y-bridge/1 Focus on 'real world' tests.