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Ram Confusion


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#1
Lorddias

Lorddias

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This is my CpuZ dump

Processors Information
------------------------------------------------------------------------------------

Processor 1 (ID = 0)
Number of cores 1
Number of threads 1 (max 2)
Name Intel Pentium 4
Codename Northwood
Specification Intel® Pentium® 4 CPU 2.40GHz
Package Socket 478 mPGA (platform ID = 2h)
CPUID F.2.9
Extended CPUID F.2
Brand ID 9
Core Stepping D1
Technology 0.13 um
Core Speed 2400.0 MHz (12.0 x 200.0 MHz)
Rated Bus speed 800.0 MHz
Stock frequency 2400 MHz
Instructions sets MMX, SSE, SSE2
L1 Data cache 8 KBytes, 4-way set associative, 64-byte line size
Trace cache 12 Kuops, 8-way set associative
L2 cache 512 KBytes, 8-way set associative, 64-byte line size
FID/VID Control no
Features

Chipset
------------------------------------------------------------------------------

Northbridge VIA P4M800CE rev. 00
Southbridge VIA VT8237 rev. 00
Graphic Interface AGP
AGP Revision 3.0
AGP Transfer Rate 8x
AGP SBA supported, enabled
Memory Type DDR
Memory Size 512 MBytes
Channels Single
Memory Frequency 133.3 MHz (3:2)
DRAM Interleave 4-way
CAS# 2.5
RAS# to CAS# 3
RAS# Precharge 3
Cycle Time (tRAS) 6
Command Rate 2T


Memory SPD
------------------------------------------------------------------------------

DIMM #1

General
Memory type DDR
Manufacturer (ID) Micron Technology (2CFFFFFFFFFFFFFF)
Size 256 MBytes
Max bandwidth PC2100 (133 MHz)
Part number 16VDDT3264AG-265B1
Serial number 641412A9
Manufacturing date Week 04/Year 02

Attributes
Number of banks 2
Data width 64 bits
Correction None
Registered no
Buffered no
Nominal Voltage 2.50 Volts
EPP no
XMP no

Timings table
Frequency (MHz) 100 133
CAS# 2.0 2.5
RAS# to CAS# delay 2 3
RAS# Precharge 2 3
TRAS 5 6


DIMM #2

General
Memory type DDR
Manufacturer (ID) Samsung (CE00000000000000)
Size 256 MBytes
Max bandwidth PC2100 (133 MHz)
Part number M3 68L3313CT1-CB0
Serial number 21B5DA01
Manufacturing date Week 09/Year 02

Attributes
Number of banks 2
Data width 64 bits
Correction None
Registered no
Buffered no
Nominal Voltage 2.50 Volts
EPP no
XMP no

Timings table
Frequency (MHz) 100 133
CAS# 2.0 2.5
RAS# to CAS# delay 2 3
RAS# Precharge 2 3
TRAS 5 6

---------------------------------

Alright, so I ordered a 2x512mb pair of ram for my computer because my current stuff is junk. The ram I ordered is DDR 400, but in my motherboard manual its telling me that it by default sets it to 333 if its 400 (thats what it says in the Specifications of my motherboard, doesnt state Mhz or not). What confuses me is why does my motherboard set it to 333 by default? Also, if I change it from auto, would I also have to change the CPU bus to match? If I do set it to 400 would it in anyway be able to damage my motherboard or something? In my manual it says "Note: If you use 400 MHz memory module, the default data of this motherboard will run the efficiency of 333 Mhz." This is what adds to my confusion, in the bios it states "DRam Frequency - Allows you to set the DDR operating frequency. If you select [Auto] the motherboard will detect memory modules and assigns appropriate frequency automatically. Config options: [Auto] [133 Mhz (DDR266)] [166 Mhz (DDR333)] [200 Mhz (DDR 400)]" Now this is where I'm totally blown away, is there a DDR 800 that for some reason I never heard of that clocks at 400 Mhz but since the motherboard cant support it, it goes to 333 Mhz? Or is it what I think it is, the DDR 400 will clock to DDR 333?

I haven't gotten the ram yet, I just ordered it recently. I thought I'd post this now though, so that when I do get my ram and it doesn't go to 400 by default ( 200 Mhz ) and goes to 333 (166 Mhz) should I set it to 400 manually?

Edited by Lorddias, 26 December 2007 - 12:22 AM.

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#2
Neil Jones

Neil Jones

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The first D in DDR stands for double.

The processors run at either 200Mhz, 266Mhz, 333Mhz or 400Mhz Front Side Bus. (yours runs at 200FSB). The trick is to match the memory. When you buy DDR400 memory, technically its only running at 200Mhz but it's able to send twice as much data, therefore it gets classed as DDR400, which is 200x2.

If you set the appropriate option in BIOS to auto and then feed it some DDR400 memory, and you have a processor that can handle it, most boards will run at 333Mhz for compatibility reasons. If you know that your memory and your CPU are basically on the same wavelength, then you can set it to 400Mhz manually.
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