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Memory slots vcg-rb42g motherboard memory slots 2 are black 2 are blue what are the difference in them.

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Re: memory slots

The colored ram slots are for paired sets to run in dual mode.

Posted on Dec 30, 2007

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My mobo has 4 memory card slots

1) All of your memory must be compatible with your motherboard (DDR, DDR2, or DDR3 and speed and latency). For best results, if you have dual channel capability, each pair of memory sticks should be matched. (Usually consecutive serial numbers indicate pairs from a given manufacturer.) Both sets of memory should be rated at the same speed (or the slowest speed will be your memory speed). Some motherboards may not work with all 4 slots occupied unless the memory was certified to work as a set of 4.

2) Which motherboard do you have? The motherboard manufacturer and memory companies often will have lists of compatible memory. The motherboard manufacturer will also have information on the dual-channel pairing.

My current and previous motherboards have had memory slots in color pairs (blue, black). For my boards, I put the sticks in the blue slots (A2 and B2) first. (Preferably these should be the largest memory capacity.) Then I put the second pair of memory into the black slots (A1 and B1). DIMM slot A1 is closest to the CPU; B2 is the farthest away from the CPU.

Depending on your CPU cooler, you may need to remove it or modify it to use all 4 DIMM slots.

Observe the appropriate steps to avoid static discharges while handling your memory and when inside your computer. For actually inserting the memory, make sure that the locks (white on my motherboards) are fully open (hinged away from the slot). Line up your memory so that the slot in the memory is on top of the key in the slot and the memory is centered in the slot. It will only line up one way; the wrong memory type will not line up. Push your memory stick down fully until the locking clips rotate up and fully engage the memory. (You may need to push down at multiple places to get it fully seated.) You will then repeat the procedure with the rest of the memory.

Note: if you get a memory error, three beeps (on many boards), you will need to remove the memory and test one stick at a time in the A2 slot (for example). Then test pairs of slots. It is not unknown for either one stick to be bad or one slot to be bad. Look at the total memory your OS identifies, if you manage to boot in spite of any issues. Running Memtest may be needed but even that may not identify which specific memory segment is bad.

I hope this helps.

Cindy Wells
(who has installed or replaced memory since giving an 286 computer a full megabyte of memory. DIMMs are a lot harder to mess up as long as you have the correct memory. Note: most of the different DIMM types have different number of pins; thus sometimes it's very easy to tell that the wrong memory is being used. This isn't always the case.)

Dec 05, 2012 | PC Desktops

1 Answer

Need a manual for an HP Compaq dc5100 pc

Really? It should be in Slot 1. (DIMM 1)
A Processor reads Slot 1 first.***=HP+Compaq+dc5100+20080404081+%7C+Flickr+-+Photo+Sharing%21&sigr=16pkmjpub&sigi=16irimlt9&sigb=11q4rp0eh&fr=moz35

Scroll down to the larger photos of the motherboard.

Notice how the one Black ram memory slot is closer to the Processor?
That is Slot 1.

Keep the ram memory in the same color of ram memory slots.

IF you have the SAME ram memory modules ('Stick') in the Black slots, you will be running the ram memory in a dual channel configuration.

Same thing for the white ram memory slots.

Most generally the ram memory 'sticks' are bought from the same manufacturer, so as to guarantee they are indeed the same.

Same 'speed' (Frequency rate, actually)
Same voltage used
Same ram timings
Same chip configuration

Having the two LIKE ram memory modules installed in a dual channel configuration, allows them to team up on the task at hand.

Purported to speed up the ram memory functions greatly.
Up to 30 percent.

This has found out to be bullsticks.
The actual increase is more like 1 to 2 percent.
Nothing to write home to Mom about.

(Tom's Hardware used MANY different motherboards, ram memory, processors, and associated hardware, and tested different ram memory.
All came to the same conclusion. 1 to 2 percent increase.
Why do gamers use dual channel configuration?
1 to 2 percent increase. EVERY little bit helps)

I using a dual channel configuration for your motherboard, two LIKE ram memory modules are installed in Slots 1 and 3, (Black)

Have four LIKE ram memory modules? They go in Slots 2 and 4.


Jul 01, 2012 | HP Compaq dc5100 Small Form Factor PC...

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Inspiron 531s upon starting beeps twice and pauses and beeps again. never comes up on monitor it is black

Assuming that you hear 2 short beeps and a pause before you hear 2 more beeps, your computer can not detect any memory during the power on self test. Turn off everything and unplug all of the cables. Then open the computer and carefully remove all of the memory in the machine. (Press down on the plastic latches that hold the modules in place then pull the memory stick away from the motherboard.) Replace one module and then try to reboot the computer. If this works, try the other stick(s). Try the modules in different slots until you know if any of the modules and slots work.

Replace with new memory if possible. The 531 can take 512 MB or 1 GB memory with the following specs: 667-MHz or 800-MHz DDR2 SDRAM.

If the none of the memory works in any slots, try them in another computer if possible. If the memory works in another system, then the motherboard needs to be replaced.

I hope this helps.

Cindy Wells

Sep 25, 2011 | Dell Inspiron 531s Desktop Computer

1 Answer

Installed upgraded RAM in my HP Pavilion a1030n. Now computer will not power on even with the old memory put back in. what's wrong? Everything was fine until I unplugged the computer. I took off the...

YES. The slots are for different kinds of memory. ONLY use the 2 new cards and insert them into the SAME colour slots. You should NOT mix memory types. Forget the old modules.

Feb 14, 2011 | HP Pavilion a1030n (PS585AA) PC Desktop

2 Answers

Just bought 2 1GB PNY dual Chanel memory modules for my Computer Make: HP Pavilion 061 Computer Model: RJ181AA-ABA a1600n Currently has Memory: 4 slots: 512 MB, 512 MB, empty, empty QUESTION: which slots...


Start off by putting the first memory module in DIMM slot 0 this is the slot nearest the processor. DIMM slot 1 is the slost after DIMM 0.


Jun 28, 2010 | HP PC Desktops

2 Answers

The board for this appears to have a dead ram slot.If putting ram into second slot the monitor just goes black with line distortions.Remove the Ram and install to first slot everything works ok add a 2nd...

Inspect the memory slot carefully. If there are are bent pins in the slot , you can probably align them with a pointed tip. Otherwise the best option would to replace the motherboard. Because after the process RAM is the fastest component in the computer. Out of experience in repairing the motherboards ,i recommend to replace the motherboard.

Thanks Fixya

Jun 17, 2010 | HP Compaq Presario SR1720NX (EL435AA) PC...

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I'm doing a memory upgrade. i have four memory slots, 2 blue and 2 black. i have two, 2g dimms; for dual channel operation do i use the 2 blue slots or the first blue slot and the first black...

Try them in the same-colored slots, nearest the processor. It seems ASUS (who makes your mobo) has chosen to color code their slots so those of the same color enable dual-channel. If you can't tell from the BIOS detection, try CPU-Z to verify that the memory is in the correct slots for dual-channel operation. Putting one in the wrong slot should not damage anything. It would just make it so you can't take advantage of the extra speed.

Oct 24, 2009 | HP Pavilion A6430F Desktop PC

3 Answers

Sony VAIO VGC-RB42G - No Power; Blinking green light on power

Try a different known working power supply on that computer, the green light on the power supply should be constant and not blinking. The green light on the motherboard shouldn't be blinking either but if its not getting the right voltage from the motherboard then it will blink as well.

Get a different power supply and see what happens. At that point the power supply green light should be constant, if its not then your motherboard is faulty at that point, if yout the green light is blinking on your motherboard, if both are constant then reseat the memory and CPU and only have the power supply hooked up to the motherboard and not to anything else.

If you still can't get video then at that point you know the motherboard is definitely bad.

Aug 30, 2009 | Sony VAIO VGC-RB42G PC Desktop

1 Answer


no it does not support ddr2 ram.
goto this link for mor ingormation.

good luck

Jul 09, 2008 | Gateway 504GR PC Desktop

2 Answers

Ram slots

they are pairs for dual channel memory usage.

Sep 19, 2007 | HP Compaq dx2000 Microtower PC Desktop

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