拜託，人云亦云，自己測就知道了.

我的 680 2G 用測試軟體，接近 2G 也一樣降速，所以猜是設計的邏輯，不是問題

請按任意鍵繼續 . . .
Nai's Benchmark
Allocating Memory . . .
Chunk Size: 128 MiByte
Allocated 15 Chunks
Allocated 1920 MiByte
Benchmarking DRAM
DRAM-Bandwidth of Chunk no. 0 (0 MiByte to 128 MiByte):151.10 GByte/s
DRAM-Bandwidth of Chunk no. 1 (128 MiByte to 256 MiByte):150.90 GByte/s
DRAM-Bandwidth of Chunk no. 2 (256 MiByte to 384 MiByte):150.92 GByte/s
DRAM-Bandwidth of Chunk no. 3 (384 MiByte to 512 MiByte):150.91 GByte/s
DRAM-Bandwidth of Chunk no. 4 (512 MiByte to 640 MiByte):150.73 GByte/s
DRAM-Bandwidth of Chunk no. 5 (640 MiByte to 768 MiByte):150.93 GByte/s
DRAM-Bandwidth of Chunk no. 6 (768 MiByte to 896 MiByte):150.86 GByte/s
DRAM-Bandwidth of Chunk no. 7 (896 MiByte to 1024 MiByte):150.90 GByte/s
DRAM-Bandwidth of Chunk no. 8 (1024 MiByte to 1152 MiByte):151.01 GByte/s
DRAM-Bandwidth of Chunk no. 9 (1152 MiByte to 1280 MiByte):150.74 GByte/s
DRAM-Bandwidth of Chunk no. 10 (1280 MiByte to 1408 MiByte):150.57 GByte/s
DRAM-Bandwidth of Chunk no. 11 (1408 MiByte to 1536 MiByte):150.77 GByte/s
DRAM-Bandwidth of Chunk no. 12 (1536 MiByte to 1664 MiByte):150.70 GByte/s
DRAM-Bandwidth of Chunk no. 13 (1664 MiByte to 1792 MiByte):150.79 GByte/s
DRAM-Bandwidth of Chunk no. 14 (1792 MiByte to 1920 MiByte):28.32 GByte/s
Benchmarking L2-Cache
L2-Cache-Bandwidth of Chunk no. 0 (0 MiByte to 128 MiByte):270.83 GByte/s
L2-Cache-Bandwidth of Chunk no. 1 (128 MiByte to 256 MiByte):270.85 GByte/s
L2-Cache-Bandwidth of Chunk no. 2 (256 MiByte to 384 MiByte):270.84 GByte/s
L2-Cache-Bandwidth of Chunk no. 3 (384 MiByte to 512 MiByte):270.83 GByte/s
L2-Cache-Bandwidth of Chunk no. 4 (512 MiByte to 640 MiByte):270.84 GByte/s
L2-Cache-Bandwidth of Chunk no. 5 (640 MiByte to 768 MiByte):270.84 GByte/s
L2-Cache-Bandwidth of Chunk no. 6 (768 MiByte to 896 MiByte):270.85 GByte/s
L2-Cache-Bandwidth of Chunk no. 7 (896 MiByte to 1024 MiByte):270.84 GByte/s
L2-Cache-Bandwidth of Chunk no. 8 (1024 MiByte to 1152 MiByte):270.83 GByte/s
L2-Cache-Bandwidth of Chunk no. 9 (1152 MiByte to 1280 MiByte):270.84 GByte/s
L2-Cache-Bandwidth of Chunk no. 10 (1280 MiByte to 1408 MiByte):270.85 GByte/s
L2-Cache-Bandwidth of Chunk no. 11 (1408 MiByte to 1536 MiByte):270.85 GByte/s
L2-Cache-Bandwidth of Chunk no. 12 (1536 MiByte to 1664 MiByte):270.85 GByte/s
L2-Cache-Bandwidth of Chunk no. 13 (1664 MiByte to 1792 MiByte):270.85 GByte/s
L2-Cache-Bandwidth of Chunk no. 14 (1792 MiByte to 1920 MiByte):29.79 GByte/s