SDRAM (single dynamic randomn access memory) is the older style of memory with 2 notches on the stick. The speed of SDRAM is either 100 or 133 MHz (older SDRAM was 66 MHZ - do not mix with pc133 memory !) DDR (double dynamic rate) memory has only 1 notch. The DDR memory will read twice (double) as much information as the SDRAM - the speed of DDR is from 266 to 400 MHz

DDR SDRAM is a straightforward evolution from current single data rate (SDR) SDRAM. DDR, which stands for Double Data Rate SDRAM, actually doubles the bandwidth available to your system and runs twice as fast as regular SDRAM. For example, 266MHz DDR SDRAM (133MHz doubled) has the bandwidth of 2.1GB/sec and is referred to as PC2100. The big difference between DDR SDRAM and standard SDRAM is that DDR reads data on both the rising and falling edges of the clock signal.

The SDRAM has multiple internal banks. The 16M SDRAM has 2 banks, the 64M has 4 banks. When you tell the SDRAM a ROW or COLUMN address you must also specify which BANK you are referring to. The way to do this is by the 'bank address' (BA). Herein lies the problem. For some unknown reasons, suppliers have lumped together the ROW address pins with the BANK address pins and simply refer to them as 'address' pins.

No. Even though there are systems that support both technologies, you can't have DDR and SDRAM in the same system at the same time. You'll have to choose one or the other.

No, you cannot mix them. DDR DIMMs only work if you have a DDR-enabled system. DDR will not work in an existing SDR SDRAM system, or vice versa.

Yes. DDR transfers data twice as fast as SDR SDRAM modules. This doesn't necessarily mean your system will run twice as fast, but your memory will. And faster memory will improve your computer's performance.

A PC100 or PC133 compliant memory includes a label affixed to it which identifies the module as "PC100 compliant" or "PC133 compliant" . An attempt can be made to verify it by looking at the chip marking which should indicate "-8" or "-7.5" after the string of manufacturer part number, though this may not be entirely accurate.

Actually, there's no such thing as dual-channel DDR memory. There are, however, dual-channel platforms. If you have a dual-channel platform, simply purchase your DDR memory in pairs. However, be very careful to order two modules with the exact same specifications; the modules must be identical to each other to perform correctly.

The early SDRAM DIMM design has 2 clock inputs to drive all the SDRAM chip. This was found to be insufficient due to loading on these inputs. Some 4 clock modules will not work in systems that are designed for 2 clock, but some will. SOME 2 clock modules might not work in systems designed for 4 clocks, but then again some will.

PC100 SDRAM is required for CPUs (such as the AMD K6-2/350) that runs at 100MHz front side bus speed.

No. YOU MUST REMOVE the DDR adapter from RAMCHECK in order to test the 168-pin SDRAM (or EDO/FPM) modules. DDR and SDRAM use different voltages, and the DDR adapter further loads the SDRAM test bus. To avoid flexing damage to the DDR adapter, please allow the DDR adapter to cool down prior to removing it from RAMCHECK, and carefully remove using two hands .

PC1600 is designed for use in systems with a 100MHz front-side bus (effectively 200MHz in DDR mode). PC2100 is designed for use in systems with a 133MHz front-side bus (effectively 266MHz). However, since PC2100 was designed to be backward compatible, it has essentially replaced PC1600 in systems with a 100MHz front-side bus.

DRAM stands for "dynamic random access memory," and SDRAM stands for "synchronous dynamic random access memory." As you might guess, SDRAM is a type of DRAM. Other types of DRAM include FPM, EDO, and DDR.

Though the names look similar, SDRAM and SRAM are really quite different. Static random access memory (SRAM) is usually used for the cache of a system. It is very fast and very expensive, but a relatively small amount is needed to build a cache. Cache memory was designed to improve upon the performance of the processor and the memory subsystem, and is usually located next to the processor. Most desktops and laptops use dynamic random access memory (DRAM) for the main system memory.

SDRAM (synchronous dynamic random access memory) is one type of DRAM (dynamic random access memory). Other types of DRAM include FPM (fast page mode) and EDO (extended data out).

Your system board will support this new memory if you have the PE desktop model. Please check the parts list to verify which memory speed your system is equipped with. If you have 266MHz memory and wish to upgrade, please ask your store technician to help you upgrade to 333MHz.

Make sure the cable from the case's power switch is connected properly to the board's power on jumper; refer to the motherboard manual.

PC SDRAM is a loose general term for SDRAM that runs at 66 MHz and has an SPD chip for compatibility with P-II motherboards. PC100 SDRAM refers to PC100 SDRAM chips or DIMMs that meet INTL PC100 qualification standard. These parts are designed to run at 100 Mhz front side bus (FSB) speeds. Registered SDRAM - This is SDRAM module with Register for Address and Control Signals.