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nVidia nForce 4 SLI Intel Edition

By: Shawn Baker | NVIDIA Chipsets in CPUs, Chipsets & SoCs | Posted: Apr 17, 2005 4:00 am

New Memory Technology Continued

 

nVidia DASP 3.0

 

nVidia Dynamic Adaptive Speculative Preprocessor (DASP for short) while sounding confusing can be summed down to the average computer user quite easily. DASP is a technology that helps make sure that the L1 and L2 cache is running at its optimum level. With the introduction of Hyper Threading years ago, processes and applications had to start being split across the multiple processors (1 Logical and 1 Physical).

 

- Temporal Locality: Involves using the same instruction over and over again to help reduce the latency needed to perform a task.

 

- Spatial Locality: Involves accessing data that is in a close vicinity. This form is used to move data into the L1 and L2 cache so you receive the quickest response in processors that are likely to be used in the near future.

 

These modes are controlled by the application which also contain branch and jump instructions - when the processor executes a branch or jump instruction the L1 and L2 cache are wiped clean and access to the DRAM begins which slows access times down. DASP is third generation technology that was first implemented in the first nForce chipset, the release of the nForce 2 saw DASP 2.0 introduced and the NF4 IE brings with it DASP 3.0. The reason DASP wasn't implemented in the nForce 3 and nForce 4 was due to the memory controller being built on to the Athlon 64 processor causing the technology not to be needed. With the Pentium 4 not having an inbuilt memory controller nVidia went back to work on improving a technology that they hadn't worked on for a few years.

 

DASP works by pre-fetching the data for the L1 and L2 cache on the processor which helps make memory access as quick as possible. When the L1 and L2 cache is wiped (like with any other typical Intel chipset) clean due the branch and jump instructions, instead of having to start all over again DASP is there ready to place the information back into L1 and L2 cache on your processor which is held in the chipset core-logic without accessing the memory so your system is constantly running at its peak.

 

nVidia QuickSync

 

Your conventional motherboard runs best when the FSB and CPU are running in synchronization - in other words if you're using a processor running a FSB of 400MHz you want to use memory that runs at 400MHz. The problem is as you start to overclock you can't always run the memory at the most aggressive timings and in turn this causes your memory performance to sometimes be lower then what it is was when at a slower speed with more aggressive timings.

 

nVidia have decreased the time between FSB clock domain and the memory domain as the FSB speed is increased. nVidia says this technology "ensures that the nForce 4 SLI (Intel Edition) has the shortest latency between receiving CPU requests and placing them on the memory bus."

 

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