Intel Core 2 Duo (Merom)
Intel Core 2 DuoThe Intel 2 Core is the successor of the Intel Core Duo (Yonah) processor. Even if the name seems like a second version, the Core 2 Duo is "only" a mobile version of the desktop processor with the same name and not designed for mobile applications in the first place like its predecessor. The architecture is changed in many ways, which introduced EM64T, SSSE3 and improved the performance by up to 25 percent. The 667 MHz FSB versions are part of the "Napa"- and the 800MHz FSB versions of the "Santa Rosa"-platform. It is part of the hardware from both the Centrino Duo and Centrino Pro brands. Features
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Available Types and ThinkPads featuring them
Standard Voltage
| Nr. | Frequency (MHz) | L2 Cache | FSB (MHz) | VT | core Voltage (V) | TDP (W) | ThinkPad Models | |||
|---|---|---|---|---|---|---|---|---|---|---|
| max. | min. | high | low | high freq | low freq | |||||
| T7800 | 2600 | 1000 | 4MB | 800 | yes | 1.30 | ? | 35 | ? | T61p |
| T7700 | 2400 | 1000 | 4MB | 800 | yes | 1.30 | ? | 35 | ? | R61, T61, T61p |
| T7600 | 2333 | 1000 | 4MB | 667 | yes | 1.30 | 0.95 | 34 | 20 | T60, T60p |
| T7500 | 2200 | 1000 | 4MB | 800 | yes | 1.30 | ? | 35 | ? | R61, T61, X61 |
| T7400 | 2166 | 1000 | 4MB | 667 | yes | 1.30 | 0.95 | 34 | 20 | T60, Z61t |
| T7300 | 2000 | 1000 | 4MB | 800 | yes | 1.30 | 0.95 | 35 | ? | R61, T61, X61 |
| T7200 | 2000 | 1000 | 4MB | 667 | yes | 1.30 | 0.95 | 34 | 20 | R60, T60, X60, Z61m, Z61t |
| T7100 | 1800 | 1000 | 2MB | 800 | yes | ? | ? | 35 | ? | R61, T61 |
| T5600 | 1833 | 1000 | 2MB | 667 | yes | 1.30 | 0.95 | 34 | 20 | R60, T60, X60, Z61t |
| T5500 | 1666 | 1000 | 2MB | 667 | no | 1.30 | 0.95 | 34 | 20 | R60, T60, X60, Z61m, Z61t |
Low Voltage
| Nr. | Frequency (MHz) | L2 Cache | FSB (MHz) | VT | core Voltage (V) | TDP (W) | ThinkPad Models | |||
|---|---|---|---|---|---|---|---|---|---|---|
| max. | min. | high | low | high freq | low freq | |||||
| L7400 | 1500 | 1000 | 4MB | 667 | yes | 1.2 | 0.9 | 17 | ? | X60s, X60 Tablet |
| L7500 | 1600 | 800 | 4MB | 800 | yes | 1.1 | 0.9 | 17 | ? | X61s, X61 Tablet |
| L7700 | 1800 | 800 | 4MB | 800 | yes | 1.1 | 0.9 | 17 | ? | X61s, X61 Tablet |
Thermal Specifications
The maximum temperature for safe operation is 100°C.
The catastrophic thermal protection temperature is 125°C.
GCC Optimization Flags
Intel Compiler Optimization Flags
For the SPEC CPU 2006 benchmarks, Intel used the shorthand -fast, which translates into -O3 -ipo -static -no-prec-div -xP. However, the compiler also provides the flag -xT, which activates the optimization for Core 2 Duo and SSSE3 (instead of SSE3 only with -xP).
Note on Hyper-Threading
Note that as opposed to Pentium 4/NetBurst, current Core 2 do not support hyper-threading, and therefore there is usually no option in the BIOS to activate it. Refer to Intel's Hyper-Threading Technology for a list of hyper-threading capable CPU.
