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Windows 7: RAM Speed Question


28 Feb 2010   #1

Windows 7 Home Premuim 64 Bit
 
 
RAM Speed Question

I decided to buy some RAM for my System. I have a Dell Insprion 530s, running Windows 7 64 bit

I do know that RAM has speed, listed in MHz, and Capacity, listed in MB/GB

So, my system has currently 2GB (2x1GB) of PC2-5300 modules installed, running at 667mhz

Crucial.com says my system can handle PC2-6400, which runs at 800mhz.

I ordered 2GB (2x1GB) of the PC2-6400.

I don't know if i should "add" these to the empty slots (i have four RAM Slots total) or should i "replace" these and run at 800mhz. I do believe that the system will run at the slowest mhz speed i have installed.

So...should i go 4GB at 667 or 2Gb at 800?


My System SpecsSystem Spec
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28 Feb 2010   #2

Windows 7
 
 

Replace. The system will default to running at the lowest speed.
My System SpecsSystem Spec
28 Feb 2010   #3

Windows 7 Home Premuim 64 Bit
 
 

Thought so. Just wanted to see input from other users

I will probably buy the remaing 2GB of the PC2-6400 in a few months.
My System SpecsSystem Spec
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28 Feb 2010   #4

Windows 7
 
 

To be perfectly honest, I would keep the 4GB RAM in until you can get more of the PC2-6400 sticks. Although the 2GB RAM is faster, the 4GB is larger and will yield better overall performance. At least until you have more of the PC2-6400 RAM.
My System SpecsSystem Spec
28 Feb 2010   #5
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Are you sure they are faster. Mhz is only part of the story - latency is another.
My System SpecsSystem Spec
28 Feb 2010   #6

Windows 7 Home Premuim 64 Bit
 
 

how to check what the latency is?
My System SpecsSystem Spec
28 Feb 2010   #7
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Quote   Quote: Originally Posted by dbtmellis View Post
how to check what the latency is?
Look at the specifications - especially the first one (CAS). Because, if the Dimm is 20% faster in terms of Hz but needs 40% more cycles to execute, you have not won anything.
My System SpecsSystem Spec
28 Feb 2010   #8

Windows 7 Home Premuim 64 Bit
 
 

Here is what i ordered

2GB kit (1GBx2), 240-pin DIMM, DDR2 PC2-6400 memory module
CT764974
  • Module Size: 2GB kit (1GBx2)
  • Package: 240-pin DIMM
  • Feature: DDR2 PC2-6400
  • Specs: DDR2 PC2-6400 • CL=6 • Unbuffered • NON-ECC • DDR2-800 • 1.8V • 128Meg x 64 •
This is what i have currenntly right now

1GB, 240-pin DIMM, DDR2 PC2-5300 memory module
CT700733
  • Module Size: 1GB
  • Package: 240-pin DIMM
  • Feature: DDR2 PC2-5300
  • Specs: DDR2 PC2-5300 • CL=5 • Unbuffered • NON-ECC • DDR2-667 • 1.8V • 128Meg x 64 •
According to Crucial, the CL (CAS) the lower the better.

So..my new RAM has a CL of 6, while my current RAM has 5.
My System SpecsSystem Spec
28 Feb 2010   #9

Windows 7 Ultimate (64)
 
 

Mhz versus Latency is almost irrelevant if you're not overclocking or trying you're luck as a bandwidth junkie...

Since your Dell bios doesn't provide tools to OC, as well as the MB was designed to run PC2-5300 not the 6400, there will be NO notable performance gain...

I'd suggest following the manufacturer specs with your upgrade to 4MB.
My System SpecsSystem Spec
28 Feb 2010   #10
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Right.
My System SpecsSystem Spec
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