Can you use one sided and two sided together? If they are the same pin and same speed would it matter?
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Can you use one sided and two sided together? If they are the same pin and same speed would it matter?
Actually whilst we're on the topic, what is the difference between single sided and double sided ram.
eg why is say 256Mb double sided more expesnive thatn 256Mb single sided ?
I have read about the two and apparently double sided ram performs better. But the information on it is very sparse. There isn't really no technical guide about it. I looked at peoples post and they ran benchmark test on the two different type of ram and the double sided performed better. I just want to know if it will work together.
Some boards only support one type others both so its worth checking the manual.As to the difference I believe its something to do with the DS [double sided] RAM chip density being half the SS [single sided] RAM chip density or some such but I'm sure you`ll get a more technical answer.
Well I looked over my manual and it talks about ECC and non ECC support and how you can use slower and faster ram together. And many other things that you can do to the ram by changing the timeing etc. But of course it dosen't say anything about double sided and single sided ram. I guess it is going to be trial and error and see for myself if it will work together.
They sometimes give you a mathamatical figure for the ram such as 32m x64 [256MB].
Which board are you using?
I beleive they did give one. It is a Soyo 7VCA. I can post the manual for ya if you want. You most likely understand more than I since I know lil about ram.
http://www.soyousa.com/kb/kbdesc.php?id=122Quote:
My memory is only being recognized as half size?
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To resolve this issue:
There are number of different memory types available in the market, some of the most popular memory types are based on 4 bit, 8 bit, 16 bit, and 32 bit design for the memory modules. SOYO motherboards (unless specified otherwise) can only recognize 8 bit memory modules. If a 4 bit memory(also known as high density memory) is placed on the board the system will only be able to recognize half the memory. for example if a 512MB high-density(4 bit) memory is placed on a board that does not support that memory. the memory will only read as 256MB. If you are experiencing such problems, please contact the memory manufacturer for the specs on your memory module to make sure it is 8 bit memory.
BTW I came across this tweak for your board memory bios speeds if you want to have a look http://overclocking.telefragged.com/...vcaupdate.html
64M x 64 -Bit.
How do you explain this, I am very eager to know.
Any enlightenment
This may help...
Quote:
All 72-pin SIMMs are 32 bits wide (36 with parity), but double-sided SIMMs have four RAS (Row Address Strobe) lines instead of two. This can be thought of as two single-sided SIMMs wired in parallel. But since there is only one set of data lines, you can only access one "side" at a time. Usually, 1Mb, 4Mb, and 16Mb 72-pin SIMMs are single-sided, and 2Mb, 8Mb, and 32Mb SIMMs are double-sided. This only refers to how the chips are wired-- SIMMs that are electrically "single-sided" may have chips on both sides of the board. Most 486 motherboards use memory in banks of 32 bits (plus parity), and may treat a double-sided SIMM as "two banks" (see your motherboard's manual for details). Some can take four SIMMs if they're single-sided, but only two if they're double-sided. Others can take four of either type. Pentium (and some 486) motherboards use pairs of 72-pin SIMMs for 64-bit memory. Since double-sided SIMMs can only access 32 bits at a time, you still need to use them in pairs to make 64 bits.
Dont ask me to explain the following im just reading it from a motherboard manual but:
1Mx64=8MB
2Mx64=16MB
4Mx64=32MB
....................................all the way to
32Mx64=256MB
so that would suggest your is 512MB.
Back to my quote, 72-pin SIMMs are 32 bits wide (32 bit was non parity, 36 bit-parity) A 1x 32 SIMM has 1 meg of 32 bits which is also equal to 4 megs of 8 bits which means the SIMM could hold 4 megs of RAM. I believe that you would convert it to 8 bits (32/8 = 4, 1x4 =4) thusly 4 megs of 8 bits
1Mx64=8MB (64/8 bits =8, 8x1MB= 8MB RAM)
2Mx64=16MB (64/8 bits=8, 8x2MB= 16 MB)
4Mx64=32MB (64/8 bits =8, 8x4MB=32 MB)
Oh, I forgot this one...
32Mx64=256MB (64/8 bits =8, 32Mx8= 256MB)
Thanks for the math problems, 104456. I almost forgot the RAM math. :)
So let me get this straight. High density ram is 4 bit ram which are one side ram? And 8 bit ram is double sided? So if it is single sided stick of 256 my mobo will only see half of that. 10, nice link I will try that later and do some test see if it helps.
and...
64M x 64 -Bit. (64/8 =8, 64x8= 512)
I know now that if you motherbaord only supports double sided ram you can use single sided but only use half the ram. But what if a motherboard only supports single sided can you use double sided at all?
Thanks for the explanations S.M.G. and 104456.
10, that link you gave me improved the read and write time considerably. Well the single sided ram is on another pc of mine that I am about to trash. I ran Everest on both pc and looked at the info about the ram and it is exactly the same.
Module Size 128 MB (2 rows, 4 banks) except with the ram that is single sided it states 1 rows, 8 banks and that one is 256.
Module Type Unbuffered
Memory Type SDRAM
Memory Speed PC133 (133 MHz)
Module Width 64 bit
Module Voltage LVTTL
Error Detection Method None
Refresh Rate Normal (15.625 us), Self-Refresh
Highest CAS Latency 3.0 (7.5 ns @ 133 MHz)
2nd Highest CAS Latency 2.0 (10.0 ns @ 100 MHz)
Memory Module Features
Early RAS# Precharge Not Supported
Auto-Precharge Supported
Precharge All Supported
Write1/Read Burst 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 Not Supported
Redundant Row Address Not Supported
Also does Everest report system info worng often? Because it claims that my system can only take 256 megs of ram in each slot and I have 4 slots. Where as I have 3 and can take 512 in each slot. I used to have 512 until the ram went bad.
Ok after finding the web site equvalint of ram for dummies. I found out I have 16 bit sdram. And 16 bit sd ram is for system that max out a 512, 768 or 1024. The 256 is 32 bit and is for system that max out at 1.5 or above. That is why Everest says 256x3 which equals 768. My motherboard supports up to 1.5 in 32 bit ram. So I can use the 32 bit 256. But it also supports up to 768 in 16 bit. But I have yet to see if you can mix 16 bit and 32 bit ram. I have seen that if your mobo dosen't support 32 bit you will only see half. Well if my mobo supports 32 bit so I can see all of the 256 but I wonder if I can do that with my 16 bit 128 in there also? My manual says I can mix different types of ram. I wonder if they mean the same thing by that. I guess I will wait and see after I get the 256.
Hey JC -
where did u find web site equvalent of ram for dummies ?
could u post the link please for me !
http://home.cfl.rr.com/bjp/ This website is from 2002 but there is still good info and easy to under stand. Well can't say exactly easy but easier than most.