Question about Jetway V266B Motherboard

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2 x 1GB Samsung PC2100 appearing as just 1GB (2 X 512MB)

Hello, I tried upgrading to 2 x 1GB DDR Samsung PC 2100 266Mhz DIMMs (from 2 x 256MB SIMMs), but both the BIOS and Windows see only 2 x 512MB.
Before buying the new memory I tried 2 x 512MB Samsung DIMMs and all worked well.
The MoBo manual says that it can take 2GB.
Is there a solution for this, or is it just that the memory is incompatible?
Here are some specs for the new RAM
GENERAL SPECIFICATIONS

  • 184 PIN Memory
  • 3.2 GB/sec
  • 266Mhz
  • 2.5 Volt Module
  • DIMM (DUAL IN-LINE MEMORY 128 X 64) HIGH DENSITY
  • Non-ECC, Non-Parity
  • Unbuffered

Thank You for your help,
Patrick J.

Posted by on

  • Patrickjh Jul 02, 2008

    Hello Mike,
    Thanks for your quick response.


    If you cannot run more than 512MB in any DIMM slot,(which seems to be the case) and there are only two 184 pin DIMM slots, how is it possible to run 4 x 512MB?
    The other  two slots are 168 pin SIMM slots and will not accept DIMMs.


    I'm still confused.


    It seems that the information given in the Manual is unreliable! The information given in the table on page 10 seems to say that the limit in any slot is 512MB. Yet it clearly states that up to 2GB can be used.


    The Manual also refers to  Bank 0,1 (DDR1)and Bank 2,3 (DDR2)


    Is there a difference between a "Bank" and a "Slot"?


    On the other hand, the 2GB max. is repeated on many website and there is no reference to a problem.


    Perhaps there is something about DDR DIMMs that I am misunderstanding.


    Can you offer any further clarification.

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Hi Patrick,
I see you're point. I know this, you can not run "more than" 512MB in any DIMM slot. That is shown at the bottom of page 10 & the top of page 11. You can not run both types of memory at the same time, even though the chart looks like you could. The description term on page 10, states; Users only can install either 168-pin SDRAM Module or 184-pin DDR DRAM Module at one time. (You can't run both). You can run 4x512MB in all banks using184-pin DDR SDRAM. Or you can run 4x512MB in all banks of 168-pin SDRAMs. Total of 2GB.
So you can not run 1GB of memory in any bank.

Mike

Posted on Jun 29, 2008

  • Mike Peluso
    Mike Peluso Jul 03, 2008

    Every way I look at this it just seems wrong. Rather than sending you away (Not how I want this to go). Let me send you to a fried of mine here. Find, Benimur & click his ask me button.

    Or just click here:
    http://www.fixya.com/users/benimur



    I have a lot of faith in Benimur & he's a great guy. It's ok to mention I'm sending you to him. I just want you to have the best shot at getting this right. (Vote's mean very little if I am stumped & you do not get a decent answer that make's sense).



    Mike






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Hi,

Your post indicating that you are moving up from SDRAM to DDRAM shows that your motherboard is capable of either type (having both type of slots) and therefore would have been a few years old. Having said this, then your MB would have the very early version/compatibility of DDRAMs where/when 512 then was the highest readily available memory.

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2 G would be right for the 4 X memory slots versions (at 4 X 512) but since you have the 2 + 2 (2 SDRAM + 2 DDRAM), maximum would only be 1 Gb (2 X 512).

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Link to your manual:
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http://www.tigerdirect.com/applications/category/category_slc.asp?CatId=548&Nav=|c:147|&Sort=0&Recs=10

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