Updgrading Dell Studio 1558 RAM problem?

Steve B,

Memory

The Studio™ 1558 system uses 1067 / 1333 MHz SODIMM DDR3 unbuffered SDRAM. DDR3 SDRAM or double-data-rate three synchronous dynamic random access memory is a random access memory technology. It is a part of the SDRAM family of technologies, which is one of many DRAM (dynamic random access memory) implementations, and is an evolutionary improvement over its predecessor, DDR2 SDRAM.

Its primary benefit is the ability to run its I/O bus at four times the speed of the memory cells it contains, thus enabling faster bus speeds and higher peak throughputs than earlier technologies. This is achieved at the cost of higher latency. Also, the DDR3 standard allows for chip capacities of 512 Megabit to 8 Gigabit, effectively enabling memory modules of maximum 16 Gigabit in size.

DDR3 memory comes with a promise of a power consumption reduction of 30% compared to current commercial DDR2 modules due to DDR3’s 1.5 V supply voltage, compared to DDR2’s 1.8 V or DDR’s 2.5 V. This supply voltage works well with the 90 nm fabrication technology used for most DDR3 chips. Some manufacturers further propose to use "dual-gate" transistors to reduce leakage of current.

The main benefit of DDR3 comes from the higher bandwidth made possible by DDR3’s 8 bit deep prefetch buffer, whereas DDR2’s is 4 bits, and DDR’s is 2 bits deep.

Theoretically, these modules could transfer data at the effective clock rate of 800-1600 MHz (using both edges of a 400-800 MHz I/O clock), compared to DDR2’s current range of effective 400-800 MHz (200-400 MHz clock) or DDR’s range of 200-400 MHz (100-200 MHz). To date, such bandwidth requirements have been mainly found in the graphics market, where fast transfer of information between frame buffers is required.

Memory Configuration

Studio™ 1558 DIMM Configuration

Slot 1

Slot 2

Total Memory

1 GB 1 GB

1 GB 1 GB 2 GB

2 GB 2 GB

2 GB 1 GB 3 GB

2 GB 2 GB 4 GB

4 GB 4 GB

4 GB 1 GB 5 GB

4 GB 2 GB 6 GB

4 GB 4 GB 8 GB

Memory Modes Supported

The Studio™ 1558 supports the following memory mode operations with performance depending on configuration: •Dual-channel symmetric mode, in which both channels are populated with the same memory size. This configuration yields peak memory performance as both channels are used simultaneously.

•Dual-channel asymmetric mode, in which both channels are populated but with different memory amounts. This configuration yields the performance of a single channel of memory with the combined memory size of the two channels.

•Single-channel mode, in which only one channel is populated.

A NOTE indicates important information that helps you make better use of your computer. NOTE:

DDR3 DIMMs have 240 pins, the same number as DDR2, and are the same size, but are electrically incompatible and have a different key notch location.

Thank You,,

Dell-Jesse L

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