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== == 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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โˆ™ 2008-11-17 10:14:26
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Q: What is the difference between SDR RAM and DDR RAM?
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Related questions

What is the difference between ddr sdr ram?

sdr means single data rate & ddr means double data rate

What is beter to speed up a p4 computer a DDR or a SDR?

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

Ddr and sdr ram different?

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

Can you replace pc333 with pc133?

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.

What is the biggest difference between SDR and DDR memory?

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.

Is ddr or sdr ram will support Intel Pentium processor 733 mhz computer?


Can you put ddr on the motherboard with sdr?


Which is more speedy sdr or ddr rams?

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

Is 512 SDR RAM or 256 DDR RAM better?

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?

How can you recognize the sdram and ddr?

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.

How is SD RAM different from DD RAM?

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 or Good luck!

What type of memory does an Intel Pentium 4 motherboard support?

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

Can you DDR SDRAM in an SDR SDRAM slot?


What type of RAM would a computer with an Intel Pentium 4 1.7 GHz processor have?

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.

What is the difference between DDR RAM and DDR2 RAM?

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.

If you have three slots on your motherboard and three 256 sdr RAM chips can you put them all in for a total of 768 sdr?

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.

Can you use DDR SDRAM modules in an SDR SDRAM slot?


Can you convert a motherboard that uses SDR SDRAM modules to DDR SDRAM?


Will a DDR SDRAM module fit in an SDR SDRAM slot?

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.

Can I use a sdram insted of ddram?

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

Which type of memory module is used in a desktop computer?

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

What prevents sdr sdram sticks from fitting into slots designed for ddr sdram sticks?

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

How do you set the jumpers on a motherboard that uses sdram and ddr?

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.

How do you replace your RAM on a computer?

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.

Full form of sdr?

SDR-Single Data Rate