Question about Jetway V266B Motherboard

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Jetway MoBo: 2 x 1GB Samsung PC2100 appearing as just 1GB (2 X512MB)

Hello Benimur, Mike (map9966) suggested that I contact you with this problem. Here's what I originally wrote to Mike:-
"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.
And this was his reply:- "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."


I don't quite understand this reply, so this is what I wrote to Mike:-
"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." 

I would be vert grateful if you could offer any further clarification or a solution to this problem.
Regards, Patrick.

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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.

As most Taiwan manufacturers, Jetway would be publishing specs that are a bit just over rated in terms of their product performance unlike Asus, ABit, AOpen. Additionally, most have been known to be using the same manual for several versions of the motherboard. A similar looking motherboard can come in several versions such as those with internal video while another is an AGP slot; one versions may or may not have built-in Ethernet port. In the same token, a version may have 2 X SDRAM slots + 2 DDRAM slots or 4 X SDRAMs or 4 X DDRAMs. Again, we are talking of the same model number of the motherboard but different versions/revisions.

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).

Hope this be of additional help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 03, 2008

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Posted on Jan 02, 2017

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1 Answer

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


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

Jun 29, 2008 | Jetway V266B Motherboard

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Is pc400 compatible


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May 15, 2008 | Jetway V266B Motherboard

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Upgrade of ram


Your board Support 168-pin SDRAM DIMM and 184-pin DDR DIMM (Can't Use DIMM & DDR SDRAM memory Together).
I would run the 184-pin DDR. Supports PC1600/PC2100 DDR DRAM up to 2BG Max. Since you have four memory slots 2x512mb of DDR PC2100 = 1GB would be plenty. You will notice programs load faster & games run smoother. Personally, 2Gb. may help but you will not see the difference. To see a difference it is not all about memory. Mb bus speed, CPU, chipset & speed of video memory all play a part with regards to Pc overall speed. You can download your manual here.: http://www.jetway.com.tw/oldweb/evisn/download/manual/index1.htm
You can download the specs of your board here.:
http://www.jetway.com.tw/oldweb/evisn/product/amd/v266b/v266b.htm
And below is a link for some good ram.:
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=302039&CatId=548
This should all help you decide, best wishes!
Please vote.....

Jan 23, 2008 | Jetway V266B Motherboard

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Want to up grade to 2g ddr mem


hi

is this your board?

http://www.geniyisis.com/index.html?/Jetway/v266b.htm

well, if this is your board, you can upgrade your ram to 2gb howerver since it is a dual ram...(SDRAM and DDR) you cant use all the slots at 1 time since they are of different frequencies.

you can use DDr266 (pc2100) as your RAM since this board is a socket A as it is said here in the boards specs.

hope this helps

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DDR & SDRAM supported?


I suggest you stay within your manual specs.
Your boards memory should not use voltage higher than CL2.5
Below is a link for 1Gb dimm DDR266 PC2100. CL2.5
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=80388-1
You can also buy two which would take you to the motherboards MAX memory of 2Gb.

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