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Memory running slow


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module number is VS512MB400

Here is info on computer from CPU-Z

CPU-Z Report




CPU-Z version 1.31.




Number of CPUs 1


Name Intel Pentium 4

Code Name Northwood

Specification Intel® Pentium® 4 CPU 2.66GHz

Family / Model / Stepping F 2 9

Extended Family / Model 0 0

Brand ID 9

Package mPGA-478

Core Stepping D1

Technology 0.13 µ

Supported Instructions Sets MMX, SSE, SSE2

CPU Clock Speed 2660.0 MHz

Clock multiplier x 20.0

Front Side Bus Frequency 133.0 MHz

Bus Speed 532.0 MHz

L1 Data Cache 8 KBytes, 4-way set associative, 64 Bytes line size

L1 Trace Cache 12 Kµops, 8-way set associative

L2 Cache 512 KBytes, 8-way set associative, 64 Bytes line size

L2 Speed 2660.0 MHz (Full)

L2 Location On Chip

L2 Data Prefetch Logic yes

L2 Bus Width 256 bits




Mainboard and chipset

Motherboard manufacturer Dell Computer Corp.

Motherboard model 02Y832,

BIOS vendor Dell Computer Corporation

BIOS revision A12

BIOS release date 08/26/2004

Chipset Intel i865P/PE/G/i848P rev. A2

Southbridge Intel 82801EB (ICH5) rev. 02

FSB Select 533 MHz

Performance Mode enabled


Graphic Interface AGP

AGP Status enabled, rev. 3.0

AGP Data Transfer Rate 8x

AGP Max Rate 8x

AGP Side Band Addressing supported, enabled

AGP Aperture Size 128 MBytes






DRAM Size 1024 MBytes

DRAM Frequency 166.2 MHz


CAS# Latency 2.5 clocks

RAS# to CAS# 3 clocks

RAS# Precharge 3 clocks

Cycle Time (TRAS) 7 clocks

# of memory modules 2

Module 0 Corsair DDR-SDRAM PC3200 - 512 MBytes

Module 1 Corsair DDR-SDRAM PC3200 - 512 MBytes





Windows version Microsoft Windows XP Home Edition Service Pack 2 (Build 2600)

DirectX version 9.0c

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I am having a problem with som cosair PC3200 512MB memory sticks that are suppose to run at 400mhz but according to my Setup screen of my computer(Dell 4600) my memory is only running at 333mhz can anyone help?:confused:



I've just looked at the CPU that your Dell 4600 is running. You have only a 533FSB CPU (actual FSB clockspeed of 133MHz) - but running your PC3200 memory at 200MHz (DDR400) with a 133MHz FSB CPU is considered out of spec for the i865PE chipset (due to the 67MHz differential between the actual memory clockspeed and the CPU's actual FSB clockspeed), according to Intel (Intel officially supports asynchronous memory operation only up to +/-33.3MHz from the CPU's actual FSB clockspeed on their DDR1 chipsets/memory controllers). With a 533FSB CPU, you can use only PC2100 or PC2700 memory - and your VS1GBKIT400 got downclocked to 166MHz (DDR333) due to your CPU's slow 133MHz FSB clockspeed.


On the other hand, your system's chipset does support 200MHz/DDR400 memory operation - but only if you have an 800FSB (actual 200MHz FSB) CPU.

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So should I change to PC2700 and stay at 333mhz or is there no way to get it up to 400mhz?


Actually, Dell provides no way at all whatsoever to manually change the memory speed. So your PC3200 memory will run at 166MHz/DDR333 with your CPU no matter what.

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  • Corsair Employee

This is a chipset limitation.

If the FSB of your CPU is 400 For Intel and 100 MHz for AMD, the memory speed supports only DDR 266.

If the FSB of your CPU is 533 For Intel and 133/166 MHz for AMD, the memory speed supports DDR 266/333

If the FSB of your CPU is 800 MHz for Intel and 200 MHz for AMD, the memory speed supports DDR 333/400

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