AMD双核心A64处理器支持超线程？-快科技-科技改变生活

AMD双核心A64处理器支持超线程？

P2MM
2005年04月19日 16:40
0

我们都知道超线程是Intel P4处理器和双核心Pentium XE处理器专利，但是根据AMD Athlon 64双核心处理器测试者发现，Athlon 64双核心处理器也内置超线程功能。测试者对比单核心Athlon 64处理器和双核心Athlon 64的CPUID寄存器，对EAX＝1指令的反应：

Athlon 64 Simple Core - CPUID (EAX = 1)

Hex (EDX): 0x078bfbff

Bin (EDX): 0b00000111100010111111101111111111

Hex (EBX): 0x00000800

Athlon 64 Dual Core - CPUID (EAX = 1)

Hex (EDX): 0x178bfbff

Bin (EDX): 0b00010111100010111111101111111111

Hex (EBX): 0x00020800

显然在是否支持超线程的EDX寄存器当中，双核心Athlon 64的28位bin值显示1，即支持，单核心Athlon 64的28位bin值显示0，即不支持。在显示逻辑计算核心的EBX寄存器当中，双核心Athlon 64处理器的Hex值为2，单核心的Athlon 64处理器的Hex值为0。目前尚不清楚双核心Oteron处理器是否也支持超线程。

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