by Barbara Aichinger | Mar 20, 2018 | BITCOIN, Data Center, DDR4 Memory, Uncategorized
Attention all Bit Coin, Ethereum Miners, Block Chain Fans and Distributed Ledger Technology experts. Do you REALLY understand the computing limits of your hardware? These applications are among the most compute intensive applications today. Like most compute intensive applications DDR Memory is involved. There is some confusion over memory bandwidth versus memory latency. Latency is the time to first access. See below examples of a memory subsystem running well below the minimum latency allowed by the JEDEC DDR4 specification for some parameters. Identifying these bottle necks can dramatically increase your memory access time thus your mining application. Tuning your system for minimum latencies can add $$ to your crypto wallets. Figure 1: DDR4 Memory Latencies measured on every clock cycle continuously. Measurement made by the DDR Detective from FuturePlus Systems Bandwidth on the other hand is the amount of data that can be transferred over a certain time. This is the Mega Bytes per Second metric. See below. This metric is important as it determines the amount of data bandwidth that can be sustained over a longer period of time. If your latency can be improved this number will also improve. Figure 2: DDR4 Memory Bandwidth measured on every clock cycle continuously on a per bank per rank basis. Measurement made by the DDR Detective from FuturePlus Systems If your mining hardware is using the latest DDR4 Memory there is another metric (over DDR3) that needs to be considered. That is Bank Group tuning. In DDR4, back to back transactions to the same Bank Group, results in a performance penalty. Back to back accesses to different Bank Groups is...
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