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Microsoft Says Tipping Point Already Reached

According to a source inside Microsoft, over 25 percent of Vista installations in the US at the end of last year were 64-bit. There were several major drivers for the switch to 64-bit, most related to cheap DDR2 DRAM.

Jon DeVaan, Senior Vice-President of the Windows Core Operating System Division, agrees. "From our point of view we believe that we have accomplished the tipping point in terms of 64-bit adoption. Now, this happened to a large degree because memory prices are coming down, and another dynamic that we've seen in the United States is that the retail channel is looking to use RAM upgrades as a way to boost margin. So what that means is that 64-bit machine run rate is increasing rapidly, and that means our ability to support those 64-bit machines fully in the broad ecosystem is a really important thing."

Any PC with 4GB of RAM or more must use a 64-bit installation of Windows in order to address the full amount of RAM. Typically a 32-bit installation would recognize a maximum of 3-3.5GB of RAM.

Instead of purchasing a 32-bit version and then having to change to 64-bit later when they purchase more RAM, many are choosing 64-bit at the start. Over 75 percent of Windows sales are based on OEM installations of new computers.

The majority of Core i7 platforms are also using 64-bit operating systems, due to the triple channel memory setup using more RAM.

If you bought Windows Vista as a retail packaged product, Microsoft offers a free 64-bit upgrade DVD for the cost of shipping and handling. The upgrade will be a full clean installation over the 32-bit version. Windows Vista Ultimate already includes 32-bit and 64-bit versions on the DVD.

Many OEMs also provide a free or low cost option to switch to 64-bit Vista.

Windows 7 is expected to be the last to natively run at 32-bits. The next major Windows revision after it will be 64-bit native, running 32-bit applications through the use of a compatibility layer.

Windows Server 2008 R2, the server version of Windows 7, is already exclusively 64-bit.

With the switch to Windows 7, it would be easiest for PC OEMs to adopt 64-bit exclusively. That would reduce the number of SKUs (Stock Keeping Units) and drivers that would be needed by half, not an insignificant number when you consider that Windows 7 will ship in at least 4 editions. Multiply that by at least 34 localized language versions.

Additionally, the price premium of DDR3 will drop significantly as 50nm production kicks in. DDR3 is the memory of choice for AMD's CPUs using the AM3 socket, as well as Intel's Core i7 and Core i5 (Lynnfield). Due to lower power consumption, DDR3 adoption on laptops is progressing rapidly as well.

"Put more simply, usage of 64-bit Windows Vista is growing much more rapidly than 32-bit. Based on current trends, this growth will accelerate as the retail channel shifts to supplying a rapidly increasing assortment of 64-bit desktops and laptops," said Chris Flores, a Director on the Windows Client Communications Team.

Since 64-bit Vista and Windows 7 can run 32-bit applications, the last remaining hurdle is driver compatibility. Many new devices now have 64-bit device drivers available for Vista, and those should be mostly compatible with Windows 7.

An important tool is the Windows Vista Compatibility Center. Devann thinks that 64-bit support will drive sales: "They can go here and look at 64-bit compatibility, and with the trend that we just saw this is a good place for communicating with your customers about your support for 64-bit, so that they can prefer your product if they have one of these 64-bit systems".

Devann addressed the crowd at WinHEC with the following message, "I urge everyone here to make sure that you have the right 64-bit support, and in general 32-bit software runs fine on 64-bit Windows, but when it comes to drivers, that's where the work is. And with this audience, it's something that we're all acutely aware."



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RE: Slight error
By Targon on 1/22/2009 6:48:23 AM , Rating: 3
There is a big issue with 32 bit though, and PAE would never get around it. With 32 bit, you are limited to 4GB worth of address space for any application to use at one time. Sure, there are ways to work around this, but the problem is there. You also have the issue that in the 32 bit world, your video card memory MUST sit below the 4GB mark, so if you have a video card with 2GB of memory(the highest end cards are starting to hit this), that means you have under 2GB of RAM available to your applications.

So, 64 bit really is the way to go at this point, and the sooner we have 64 bit as the "norm", the sooner driver quality for 64 bit will get to the quality level we had for 32 bit. That has been a major issue under Vista 64 bit to this day, the lack of 64 bit drivers for some devices, the generally lower quality of what 64 bit drivers there is, and the need to be VERY careful before going 64 bit in the first place, because certain devices may just not work. Look at Linksys wireless cards and there is ZERO mention of 64 bit. With the exception of perhaps 2 or 3 cards, all 64 bit driver support is provided by other users finding the right chipsets that come with driver support, and there is no way to know without digging through every model and checking the driver list to see if x64 is even mentioned.


RE: Slight error
By anotherdude on 1/22/2009 9:04:25 AM , Rating: 2
I believe the limitation is 2 gig per application and not 4?


RE: Slight error
By Etsp on 1/22/2009 11:23:32 AM , Rating: 2
I think that 2gig limitation is because windows reserves 2 gigs for the kernel...


RE: Slight error
By mindless1 on 1/22/2009 10:50:06 AM , Rating: 2
Yeah, but nobody in their right mind ever used any Linksys driver, since they were always a few steps behind what was current at the time, even for a generic 8139 100Mb ethernet card.


"Vista runs on Atom ... It's just no one uses it". -- Intel CEO Paul Otellini

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