sdasd

1. Intelligent RAM
A microprocessor into a memory chip
Dave Patterson, Berkeley, 1997

2. Context
Distinct manufacturing lines
Processor-Memory performance gap
Memory wall
Awkwardness of DRAM chips
Time to unify logic
and memory

3. Advantages
Higher bandwidth and lower latency
 Less distance (no bus) and less complexity
Less energy consumption
 Less heat, better performance
Costs efficient
Save board space

4. Disadvantages
Consequences on cost/bit and refresh
rate
Manufacturing challenges
Reduce interchangeability
ILP trade-off

5. VIRAM
2 2
2
2
2
2
2 2

6. Microarchitecture

7. Results
Multiple operations can execute
concurrently across parallel lanes
High performance
but
Not efficient with short vectors
Useless for non-vectorizable parallelism

8. Conclusion
VIRAM / DIVA not real successes
but implications in embedded systems
Intel : Through Silicon Vias, personal
technology to connect DRAM and
processor
First step to IRAM ?