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MSI 875P TWINX2048-3500LLPRO or ?


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Help me decide & find 'perfect' dual-channel SDRAM for my 875P to make its last stand in the

war for stable max performance. Primary excuse for performance is gaming. Doom3, HL2, BF2,

F.E.A.R., COD2, Quake4 etc...


Specs: MSI 875P Neo-FIS2R, bios AMI 2.4, P4C 3.2 800 FSB (OC 433norm-466max), AIW x800 XT

500/500 (OC 508/564), G-Power 120mm omni-directional cooler with 4 pipe sintered powder

wicks. Solid pure copper base. Heatsink is 110 x 110 x 109mm. 0CZ 520W PowerStream, RAID0 x2

Barracuda 7200.7 NCQ 160GB on ICH5R, Audigy 2 ZS Plat Pro, XP-SP2 Pro. HyperX 2x512 PC3500

kit at DDR432 2-3-3-8, PAT ON Turbo (4 of 5).


The RAM is headed for an AOpen AX4SPE Max II (865PE) for my son on Christmas. I must buy at

least one fast 2x512 D-C Kit now. I'm leaning toward 2GB in a 2x1GB kit or a pair of 2x512

kits. Which would perform better keeping OCing in mind. I want DDR433 CAS-2 as a min. and

will not OC beyond anything requiring CAS-3 as this is the point of diminishing returns for

my rig on forced air. Following are my choices of the Corsair memory I'm aware of.


"TWINX2048-3500LLPRO 2GB Kit DDR433 XMS3500 ProSeries"

Dual-channel testing in an Asus A8N-SLI Premium at DDR437/218MHz, "Plug and Frag" 2-3-2-6-1T

latency settings. I'd likely get the same CAS# in my i875P. I do NOT like the added hieght

for LEDs because they restrict air flow and retain rather than desipate heat. If they fail

does their circuitry effect the SDRAM or controller. Is this SDRAM IC (Infineon?) available

in 1GB or 2GB dual-channel Kit w/ or w/o LED read outs?


*Independent Findings for possible "Plug-n-Frag Auto-Configuration"

CAS# Latency/RAS# Precharge/RAS# to CAS# Delay/Precharge Delay

2.0-3-2-6 @ DDR433 2.75V SPD

* 2.0-3-2-8 @ DDR433 2.6V

* 2.5-3-2-7 @ DDR492 2.7V

* 2.5-3-2-7 @ DDR480 2.7V

* 2.0-3-2-7 @ DDR436 2.6V

* 2.0-3-2-7 @ DDR400 2.5V


"TWINX1024-4000PT 1GB Kit DDR500 XMS4000 Ultra-High Bus Speed"

Dual-Channel, latency 3-4-4-8, 2.75V. Corsair states "Plug-n-Frag Auto-Configuration" Boots

automatically using latency values optimized for bus speed. But what are these latency/bus

speed values? I don't want high clock memory that cannot gain improved latency timings in

trade of lower bus frequencies. "Plug-n-Frag Auto-Configuration" I assume are multi fixed

DDR MHz and SDRAM timings set by SPD. Could you list these to help give me a basis to select

my new memory? I am aware these are usually tweaked manually given a properly equipped mobo

as my i875P & 865PE. But many OC DIMMs will run at only advertised latency regardless of RAM frequency.


Most of all, RAM Guy, what are your recommendations for my current rig. Keep in mind I would like to

transplant this RAM into a new AMD build about a year from now by which time filling four dual-channel slots will not require that the clock cycle be doubled.


Merry Christmas,



P.S. "DDR500=250" This has what to do with Corsair's "Plug-n-Frag Auto-Configuration" (SPD?) boots automatically using latency values optimized for a selected bus speed within the PC4000 range of SDRAM kit in question.

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Looking at the TWINX1024-4000PT 1GB Kit DDR500 XMS4000 Ultra-High Bus Speed Dual-Channel Memory, latency 3-4-4-8 w/ 2.75V. They claim Plug-n-Frag Auto-Configuration Boots automatically using latency values optimized for bus speed. But what are these latency/bus speed values?


DDR500 = 250 Mhz

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