Mixing RAM..... Can it cause conflicts?

  malwarehater 23:49 11 Oct 2005
Locked

This might seem like a silly question to some but i would like to ask for some technical advice on this please guys.

When i bought my new pc it had 512 mb RAM, and it seemed to work fine, but i just thought that adding a bit more would speed things up a bit, So i added some more.

Originally it had 2 of the following RAM modules installed
-----------------------------------------
Samsung M3 68L3223FTN-CCC ]
Memory Module Properties:

Module Name Samsung M3 68L3223FTN-CCC
Serial Number F104190Dh
Manufacture Date Week 48 / 2005
Module Size 256 MB (1 rows, 4 banks)
Module Type Unbuffered
Memory Type DDR SDRAM
Memory Speed PC3200 (200 MHz)
Module Width 64 bit
Module Voltage SSTL 2.5
Error Detection Method- None
Refresh Rate Reduced (7.8 us), Self-Refresh

Memory Timings:
@ 200 MHz 3.0-3-3-8 (CL-RCD-RP-RAS)
@ 166 MHz 2.5-3-3-7 (CL-RCD-RP-RAS)

Memory Module Features:
Early RAS# Precharge Not Supported
Auto-Precharge Not Supported
Precharge All Not Supported
Write1/Read Burst Not Supported
Buffered Address/Control Inputs Not Supported
Registered Address/Control Inputs Not Supported
On-Card PLL (Clock) Not Supported
Buffered DQMB Inputs Not Supported
Registered DQMB Inputs Not Supported
Differential Clock Input Supported
Redundant Row Address Not Supported
------------------------------------------------
It seemed to work fine, but like i said, i felt that adding more RAM would speed the pc up a bit, so i added two of the following (512 MB) RAM modules to the system:

Memory Module Properties:

Serial Number None
Module Size 512Mb(2 rows,4 banks) Module Type Unbuffered
Memory Type DDR SDRAM
Memory Speed PC3200 (200 MHz)
Module Width 64 bit
Module Voltage SSTL 2.5
Error Detection Method None
Refresh Rate Reduced (7.8 us), Self-Refresh

Memory Timings:
@ 200 MHz 2.5-3-3-8 (CL-RCD-RP-RAS)

Memory Module Features:
Early RAS# Precharge Not Supported
Auto-Precharge Not Supported
Precharge All Not Supported
Write1/Read Burst Not Supported
Buffered Address/Control Inputs Not Supported
Registered Address/Control Inputs Not Supported
On-Card PLL (Clock) Not Supported Buffered DQMB Inputs Not Supported
Registered DQMB Inputs Not Supported
Differential Clock Input Supported
Redundant Row Address Not Supported
-----------------------------------------------


It doesnt seem to be working as well now as it did BEFORE i installed extra RAM??
So can mixing different makes(manufacturers)of RAM cause conflict's?

So i ran a scan using Everest Home Edition.....just to gather up info about the differences in the two makes/manufacturers

It's strange why- if you look at the specs of the 512 MB modules there doesn't seem to be:
1. Module Name?
2. Serial Numer?
3. Manufacture Date?

Though looking at the Module itself it's made by Vdata.

Apart from the three things above....I cant find any real differnce between the Modules except the Memory Timing's-

The Samsung's modules show up Memory Timing's at both 200mhz, AND 166mhz....But the Vdata modules ONLY show up timings for 200 mhz??


1. Does this mean that the Vdata modules could be incompatible with the Samsung's??....because since adding the Vdata modules the pc doesnt seem to be working so smoothly even though an extra 1GB
of RAM has been added.

2. Are Vdata RAM modules CRAP??....LOL

Thanks Guys

  DieSse 23:56 11 Oct 2005

Yes - mixing RAM *may* cause problems.

So can using more than 512Mb with Win98.

But what does "It doesnt seem to be working as well now as it did BEFORE i installed extra RAM" mean in terms of symptoms, exactly??

  woodchip 23:57 11 Oct 2005

you have missed the important bit What OS

  woodchip 00:02 12 Oct 2005

If you are running (8 or ME it will run slower

  malwarehater 00:08 12 Oct 2005

DieSse Tue, 11.10.05 | 23:56
Yes - mixing RAM *may* cause problems.
So can using more than 512Mb with Win98.

But what does "It doesnt seem to be working as well now as it did BEFORE i installed extra RAM" mean in terms of symptoms, exactly??

DieSse-

The symptoms are a general slowing down of the pc really..ie- folders etc loading slower....browsing is slower.


woodchip-

I'm running Windows XP Home Edition with SP2 preinstalled, specs are:

Specifications
CPU: Intel® Pentium® 4 Processor 519
(1MB L2 cache, 3.06GHz, 533MHz FSB)
Operating System: Microsoft® Windows® XP
Chipset: Intel® 915GV
Memory: 512 MB DDR (2x256MB), Dual Channel
Hard Drive: 250 GB SATA (7200 rpm, 8 MB Cache)1
Optical Drives: 16xDouble Layer DVD±RW Multi-Format Drive
Media Reader: 8-in-1 (USB 2.0, Secure Digital (SD), Smart Media, Compact Flash, Memory Stick, Memory Stick PRO, Micro Drive, Multimedia Card)
Video: Intel® Graphics Media Accelerator 900
Up to 224MB shared
Sound: Intel® High Definition 5.1
Modem: 56K ITU V.92 Ready Fax/Modem
Peripherals: Premium Multimedia Keyboard, PS/2, 2-Button Wheel Mouse, Amplified Stereo Speakers
Ports/Other: 5 USB 2.0 ports (4 in back; 1 in Media Reader), 1 Serial, 1 Parallel, 2 PS/2, 5 Audio-In & Out, 3 IEEE 1394 (2 in front/1 in back)

  DieSse 00:11 12 Oct 2005

If you take the new RAM out - does it speed up again?

Maybe you just been using it longer, and it's slowing down is more to do with software, spyware, general clutter, etc - than RAM.

  woodchip 00:11 12 Oct 2005

If it worked Better with old Memory why not put it back and save the new

  DieSse 00:14 12 Oct 2005

A thought - does your system have dual-channel capability? - then you might possibly have fitted the RAM incorrectly and disabled the dual-channel - this would slow the system a little.

  DieSse 00:16 12 Oct 2005

I just spotted that it does have dual-channel - didn't see that the first time I looked.

You need to consult the motherboard manual as to where you can and can't put RAM to have the dual-channel working.

  malwarehater 00:20 12 Oct 2005

Thanks guys.

I'll take out the Vdata modules later on tonight and i'll report back here if there does appear to be a difference.


Also- I've just ordered two Samsung 512mb RAM modules....So if it is a compatibility issue hopefully this will solve it.

  Chegs ® 00:27 12 Oct 2005

I had problems when mixing two different brands of RAM,on mine,it caused occasional "flickers" of the monitor,slight momentary freezes of the desktop,leading to corruption of the pic onscreen,a testing diagnostic revealed a tiny difference in bandwidth between the two brands.I struggled with its erratic behaviour for months,until my bro-in-law bought a new motherboard but was short of cash for RAM.I sold him my 3rd stick,installed on his PC it works fine,and now its out of my system,my troubles are gone.

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