Computer Memory

What is the difference between SDR RAM and DDR RAM?

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2008-11-17 10:14:26
2008-11-17 10:14:26

== == DDR stands for "Double Data Rate." This means that each time your computer gets data, it gets it on the upcycle of the clock as well as the downcycle of the clock. So it is catching double the data than before -- which means it can process twice as fast. SDRAM stands for "Synchronous Ram." The RAM is synchronized with the clock cycle and grabs a chunk of data each clock cycle so it is synchronous. Notice that it does not grab two chunks as does the DDR. So the DDR is twice as fast.

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sdr means single data rate & ddr means double data rate

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If the motherboard supports both DDR and SDR RAM, it is almost always a better idea to go with DDR RAM

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Yes they are definitely different as DDR stands for Double Data Ram & SDR stands for Single Data Ram and further explanation can be found here http://en.wikipedia.org/wiki/DDR_SDRAM

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PC133 Ram and PC333 ram are generally incompatible. PC133 RAM is SDR Ram where as PC333 is DDR RAM. Some motherboards support using either SDR or DDR but this is not usual. PC133 will not fit in the same slot as PC333.

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The difference is the speed at which is send data from the memory to the CPU. SDR = Single Data Rate DDR = Double Data Rate So in theory DDR should be twice as quick at sending data. However this doesn't mean that the computer will be twice as quick.

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The ddr rams are much faster than sdr rams. In ddr rams the data rate is twice than that sdram. Since the data can be stored on both the ends of the ddr in contrast to the single sided data storage in sdrams, the ddr rams are considered much faster than its couterpart. Their name itself describes this difference single data rate - sd ram double data rate - dd ram. ddr2 rams are even faster than the ddr1 rams

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DDR and SDR have the names mentioned on the packing.You just need to read the packet.But if you don't have one then try reading on the ram chip you will find small initials on chip saying DDR with its number.

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Depending on its age, either SDR SDRAM, DDR, or DDR2 RAM.

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512 SDR. DDR2 is better, but more the memory better it is for your PC, irrespective of the memory technology. You have a point there but considering the current trends, i will prefer the DDR because sdram is being replaced with ddr. Especially if you planning to buy a new mother board, most MoBo's nowadays are of ddr. But speed and capability is better than having plenty of ram. It is with the speed of access not only the space. Besides, it's better to consider efficiency, right?

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SD Ram is actually SDR SDRAM, and DD Ram is actually DDR SDRAM, though the former does not usually have the SDR in front of it. The letters SDR and DDR stand for Single Data Rate and Double Data Rate, and the letters SDRAM stand for Synchronous Dynamic Random Access Memory. The main difference between SDR and DDR memory is speed. There are a lot of little differences, but the main one (IMHO) that affects the user is speed: DDR can transfer data at roughly twice the speed of SDR. More speedy data rates = better performance. Just remember, the motherboard you are using must include the appropriate chipset to support the different RAM types. They are not interchangeable. SDR SDRAM comes in three main flavors: PC66, PC100 and PC133. Each successive number refers to the bus speed of the RAM in MHz, thus PC66 runs at 66 MHz, PC100 runs at 100 MHz, etc. SDR SDRAM has 168 pins at the connector. DDR SDRAM has 184 pins at the connector, which is one reason you can't just use DDR instead of SDR, and comes in many different flavors; PC2100 which runs at 266 MHz, PC2700 which runs at 333 MHz, PC3200 which runs at 400 MHz, etc. While the numbers on SDR SDRAM referred to clock speeds, the DDR SDRAM numbers come from the theoretical maximum bandwidth in Megabytes per second (MB/s). Thus, PC2100 has a theoretical maximum bandwidth of 2100 MB/s, but runs at 133 MHz. DDR SDRAM modules are now available from PC1600 all the way up to PC4400, which has a bandwidth of 4400 MB/s and runs at 550 MHz. In order to know which type of RAM you need, you must know what your motherboard supports. I recommend searching the motherboard manufacturer's website for this info, or review sites like tomshardware.com or sharkyextreme.com. Good luck!

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Motherboards of that era would have had a either a combination of the older SDR SDRAM (PC100 or PC133 RAM) and DDR SDRAM, or just DDR SDRAM.For best performance, you would want to use the DDR slots.

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Most desktops and notebooks use one of the three most popular types of synchronous dynamic random access memory (SDRAM) for the main system memory. Single data rate (SDR) SDRAM is the older type of memory, commonly used in computers prior to 2002. Double data rate (DDR) SDRAM hit the mainstream computer market around 2002, and DDR2-based systems hit the market in mid-2004. DDR SDRAM is a straightforward evolution from SDR SDRAM. The big difference between DDR SDRAM and SDR SDRAM is that DDR reads data on both the rising and falling edges of the clock signal, so the DDR module can transfer data twice as fast as SDR SDRAM. While DDR has a limited clock rate, the evolutionary changes to DDR architecture enable DDR2 to achieve speeds beyond of DDR, delivering bandwidth of 5.3 GB per second and beyond! Because DDR2 is able to operate with faster bus speeds, your memory doesn't hold back the performance of your processor. Generally speaking, motherboards are built to support only one type of memory. You cannot mix and match SDRAM, DDR, or DDR2 memory on the same motherboard in any system. They will not function and will not even fit in the same.

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yes, you can. Make sure they're all the right speed and type of RAM though. If you're putting older sticks of SD RAM in a newer computer that uses DDR RAM, you'll either get errors or just lacking performance.

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No. SDR SDRAM and DDR SDRAM modules are not interchangeable.

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While I'm sure a destructive lunatic could force a DDR module into an older slot, they are not designed to be physically compatible. DDR modules have only a single notch, while SDR modules and slots are keyed with two notches and ridges.

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DDR, DDR2, SDR, DDR3, DDR4. SO-dimm are for laptops

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usually you don't need to set any jumper settings in ddr or sdr. but if you wanna over-clock your motherboard(and it doesnt have voltage settings in its BIOS interface) you can set it by jumpers. you'll need its manufacturer's manual though. if you don't have that then atleast name of the manufacturer and motherboard's model number to look it up over the internet. crank up the ram voltage step by step. and if you're talking about clock frequency then you might be using a PC older than a P3. P3s don't run ddr. and in sdr they have 100 and/or 133 mhz clock speed. you'll need to know which ram you've got than cross reference that on your motherboard's maunal. any how i need more information for a proper answer.

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It depends on the kind of computer you have. In desktop PCs, you would need to open up the protective box (while the computer was off, of course) and access the RAM straight on the motherboard. There it can just be snapped off and replaced with RAM of the same settings for that motherboard (i.e., SDR or DDR, appropriate clocking speed range for the motherboard). In laptops the concept is similar, but gaining access to the RAM is very brand-specific. Often times easy access is only available for additional RAM. I would recommend looking at the instructions that came with your laptop.

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Formula sdr in watershed

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The number of pins at the bottom of the stick. Some ddr's have 184 pins, some newer models have 240, starting with DDR2.

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The Dell Optiplex supports a maximum of 512 MB of RAM using two 256 MB PC100/PC133 SDR SDRAM modules.

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There are certain boards out there that have dedicated DIMMs to both DDR and SDR, but you cannot mix the two under anycircumstances. I would also advise against getting on of these "hybrids" because SDR is out of date... But this might be a cheap alternative. I'd hate to see you stuck with a board you'll have to upgrade soon again though.

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Actually, it's really dependent on what you are doing. If you are using the latest O/S like Windows XP Media Center, probably the larger size will help. However, the speed of the RAM is also playing the role. I'm not sure about the latest speed of those types of RAM. I remember one type of SDRAM runs at 133 MHz, while the DDR SDRAM runs at 400 MHz or even 800 MHz (nowadays). This depends also on the mother board specifications. Check the mobo spec!In most cases DDR is faster than SDR. The 128 MB difference is too small for any of the newer computers for it to matter.Upgrade your memory size if your processes need more memory, upgrade the speed if your computer is running slow but has enough memory.In this case, just upgrade the RAM to DDR2 or DDR3.:First off, it should be noted that a computer built for SDR will not use DDR memory, and vice versa. But, also note that when memory is used in the slots available, there is a certain amount of latency when using two sticks of like memory. Most manufactures recommend that if all the slots are to be occupied, then sticks of like type, size and manufacturer is the optimal preference. Also, even if you did use sticks from different manufacturers, the speed drop is negligible. Now, the speed architecture of the memory is important too. As with DDR, there were several speeds that were built to compliment the speed of the CPU. (266 MHz, 333 MHz, 400 MHz and so forth). If you had a computer that supported 400 MHz, and you used a 400 and a 266 on the same board, the board FSB (front side bus) would default to the fastest speed of the slowest memory stick. IE: one 266 and one 400 would yield an FSB of 266. The benefit of upgrading your computer to support the newest memory architecture, DDR2, is outstanding, considering that the DDR2 is cheaper than DDR or SDR (30 to 50% differences) this alone could offset the price of a newer CPU and main board.

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To answer your question, let's make something clear: there can be four different things meant when you ask about "different types":Different technologies: for instance, SDR (Single Data Rate), DDR (Double Data Rate), DDR2 (2nd Generation Double Data Rate), etc.Different speeds: within a given technologies, the RAM can be built to run at different speeds: 800Mhz, 1066Mhz, 1333Mhz, etc.Different features: RAM designs have a bunch of other properties, depending on their target audience. Things like ECC (Error Correction), being buffered or unbuffered, are the major extra features.Different hardware: even if two pieces of RAM have #1 - #3 all the same, it is possible to construct the RAM itself from a variety of different physical chips. For instance, a 1Gbyte RAM module can be made using 8 x 1Gbit chips, or 4 x 2Gbit chips, or 2 x 4Gbit chips.The short answer to this question (which will satisfy 99% of all computers), is that a computer can use only a single technology and feature set, can use speeds equal to or GREATER than your existing RAM, and can normally use different hardware designs within that technology and feature set.For instance, the vast majority of systems which are sold as "desktops" (NOT workstations or servers), use a single type of SDR, DDR, DDR2, or DDR3 RAM (these days, it's DDR3, with DDR2 common for machines made in the last 5 years), with the feature set of NO ECC, and NO buffering ("unbuffered"). Very, very briefly around 2000-01, there were some of systems made that had BOTH SDR and DDR sockets - however, only ONE of those two sets of RAM sockets could be used at once, so it wasn't possible to use DDR and SDR RAM at the same time. Systems can use any speed of RAM, but will run at the LOWEST speed of any DIMM used - so, if you have a mix of 800Mhz and 1333Mhz DIMMs, the system runs at 800Mhz.Please check your motherboard or system documentation. It will explicitly lay out the combinations of the four factors above that can be used in your system. If your motherboard manual doesn't explicitly say it can be used, then DON'T assume it works. If you are unsure, ask your local computer repair store - they'll know for certain.

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Yes, but only with other DDR, not SDR. DDR is 184 pins where SDRAM is 164 pins. There are a few factors that will affect the speed of you memory: 1) The memory itself If you buy cheap memory then you might have slow memory. the chip can only move as fast as its slowest memory section 2) Maximum clock speed on the motherboard Your memory will only run as fast as your mobo can run it. If your mobo supports up to PC2700, buying PC3200 will only run at PC2700 speeds


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