64-bit Edition To Support Over 64 Logical Processors

Dec 28, 2008

"Windows 7 will be able to take advantage not only of faster CPUs, but of multiple processors on a single chip. The 64-bit edition of the operating system in particular will be able to support over 64 Logical Processors per machine.

In this regard, Microsoft underlined the need for software developers to adapt their applications in accordance with the evolution of processor chips and that of the Windows operating system.

Essentially, consistent gains in performance are synonymous with using parallel programming techniques in concordance with many-core processors. This is where non-uniform memory access (NUMA) comes in.

“The 64-bit versions of Windows 7 and Windows Server 2008 R2 support more than 64 Logical Processors (LP) on a single computer,” Phil Pennington, Windows Server Technical Evangelism, revealed. “New processors are now appearing that leverage non-uniform memory access (NUMA) architectures.

Within the near future, a system with 4 CPU sockets, 8 processor-cores per socket, and with Simultaneious Multi-Threading (SMT) enabled per core, will achieve 64 Logical Processors. Many server-class solutions will need to be architected with NUMA awareness in order to achieve linear performance scaling on 64+ LP systems.”

NUMA is a designed to allow a way around the limitations of the processor bus. Because of its non-linear characteristics, each processor is more intimately connected with its proximate memory, rather than with all the memory available. Unlike the Symmetric Multi-Processor (SMP) model, in which processors are all on par when it comes down to memory and I/O access, NUMA allows for memory access optimization.

“There is nothing the matter with NUMA – machines with non-uniform memory access speeds – of course, other than the fact that they introduce complex, hardware-specific programming models if you want to build applications that can harness their performance and capacity effectively.

What is decidedly new is the extent to which previously esoteric NUMA architecture machines are becoming mainstream building blocks for current and future application servers. For the connected applications of the future, our ability to build programming models that help server application developers deal with complex NUMA architecture performance considerations is the singular challenge of the many-core era,” Windows Performance Engineer Rick Vicik explained. "

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List Of Intel Processors That Support XP Mode

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It seems some of the most advanced Intel Processors doesnt support XPMode

for eg: Core 2 Quad Q8200 and Core 2 Duo E7400 wont support XPMode

so here is complete list of Intel Processors(both desktop and Mobile) that support XPMode:

Desktop CPUS

Core 2 Duo

E4300/4400/4500/4600/4700 NO
E6300/6320/6400/6420/6540/6550 YES
E6600/6700/6750/6850 YES
E7200/7300/7400/7500 NO
E8190 NO
E8200/8300/8400/8500/8600 YES

Core 2 Extreme

QX6700/6800/6850 YES
QX9650/9770/9775 YES
X6800 YES

Core 2 Quad

Q6600/6700 YES
Q8200/8200S/8300/8400/8400S NO
Q9300/9400/9400S YES
Q9450/9550/9550S/9650 YES

Core i7/Core i7 Extreme

I7-920/940 YES
I7-965/975 YES
I7-9200/9500/9750 YES

Pentium D/Pentium EE

805/820/830/840 NO
915/925/935/945 NO
920/930/940/950/960 YES
955/965 YES

Pentium for Desktop

E2140/2160/2180/2200/2220 NO
E5200/5300/5400 NO

Mobile CPU products

Core 2 Duo Mobile

L7200/7300/7400/7500 YES
P7350/7450 NO P7370 YES
P8400/8600/8700/9500/9600 YES
SL9300/9400/9600 YES
SP9300/9400/9600 YES
SU9300/9400/9600 YES
T5200/5250/5270/5300/5450/5470 NO
T5500/5600 YES
T5550/5670/5750/5800/5850/5870/5900 NO
T6400/6570 NO
T7100/7200/7250/7300/7400 YES
T7500/7600/7700/7800 YES
T8100/8300 YES
T9300/9400/9500/9550/9600/9800 YES
U7500/U7600 YES

Core 2 Extreme Mobile

QX9300 YES
X7800/7900 YES
X9000/9100 YES

Core 2 Quad Mobile

Q9000 YES
Q9100 NO

Core 2 Solo

SU3300/3500 YES
U2100/2200 YES

Core Duo

L2300/2400/2500 YES
T2050/2250 NO
T2300/2400/2500/2600/2700 YES
T2300E/2350/2450 NO
U2400/2500 YES

Core Solo

T1300/1400 YES
T1350 NO
U1300/1400/1500 YES

Source:
http://processorfinder.intel.com/Default.aspx

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[code]....

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