INTEL has efficiency problem in the Yonah core
Anandtech has an exlcusive benchmark on INTEL's Yonah dual core notebook chip against AMD's Athlon 64 X2 3800+. The Yonah is 2GHZ with 2MB cache made on a 65nm process, the Athlon 64 x2 3800+ is 2GHZ with 1MB cache (2 x 512KB). As you can see, despite having twice the cache, the 65nm Yonah CPU is slower than Athlon X2 3800+ at the same frequency in most of the tests, sometimes significantly so. For example, Yonah 2GHZ is 20% slower than Athlon 64 X2 3800+ in video encoding tests. In all, the score is 16 to 6, the x2 3800+ won 16 tests, and the Yonah won 6 tests.
This is not surprising, in a comparison of INTEL Dothan 760 (2GHZ, 2MB cache) and AMD Turion ML 37 (2GHZ, 1MB cache) done by laptoplogic, the Turion won 15 tests, the Dothan won 7 tests.
From this, one can conclude INTEL's Dothan and Yonah CPU cores are lower than Athlon 64 core on 32 bit IPC (Instructions Per Clock).
Furthermore, Yonah is a 32 bit chip based on the old Pentium III. In June 2005, Mooly Eden, an INTEL VP claimed that enterprise demand for 64 bit is low. INTEL "made a conscious decision" to not add 64 bit to Yonah to achieve reasonable battery life. Eden claimed that "It may take many years for enterprises to demand it (64 bit)". As a result, INTEL's Sossaman CPU, which is adopted from Yonah for servers, will also be a 32 bit chip. The Athlon 64 x2 is a 64 bit chip by design and can run future operating systems such as Windows Vista, which is a 64 bit OS to be released in 2006. The Athlon 64 X2 gets a 30% performance boost under a 64 bit OS.
AnandTech also compared the power consumption of two systems under max load. The Athlon 64 X2 3800+ desktop consumes 144 watts, the Yonah consumes 108 watts. The Athlon 64 X2 consumes 36 watts more. According to AMD, the Athlon 64 x2 3800+ is a 89 watt chip, therefore, the Yonah is at least 89- 36 = 53 watts*, which is basically the power consumption of two Dothan cores. This indicates that INTEL gets no power reduction by going from 90nm to 65nm. A very bad sign, because INTEL's speed will be again limited by heat. In comparison, the popular AMD Opteron 870HE, a 8 way 64 bit server processor at 2GHZ is 55 watts.
From AMD's persentation, with DSLSSOI, AMD's 65nm is much lower on power.
* Total_power = CPU_power + MB_power + Component_power
1) 144 watts = CPU_power_x2_3800 + MB_power_ASUS_A8N_SLI + Component_power
2) 108 watts = CPU_power_yonah_2GHZ + MB_power_yonah_unknown + Component_power
Noting that the same components were used in the X2 3800+ test system and Yonah test system, and CPU_power_x2_3800 is 89 watts, substract 1) from 2), we have
CPU_power_yonah_2GHZ = 89 + 108 - 144 + MB_power_ASUS_A8N_SLI - MB_power_yonah_unknown
CPU_power_yonah_2GHZ = 53 + MB_power_ASUS_A8N_SLI -MB_power_yonah_unknown
We can safely assume that the ASUS A8N SLI desktop MB consumes more power than the Yonah Notebook motherboard.
Proof: Yonah is at least 53 watts