Inside Microsoft's Xbox 360
by Anand Lal Shimpi, Kristopher Kubicki & Tuan Nguyen on November 16, 2005 5:09 AM EST- Posted in
- Systems
The Xbox 360 Chipset
As we mentioned before, the Xbox 360's North Bridge is integrated into the GPU, similar to most PC chipsets with integrated graphics. The North Bridge is on the main die of the GPU and shares the same 128-bit GDDR3 memory controller that the graphics core uses to access the Xbox 360's 512MB of memory. This bus runs at 1.4GHz offering just over 22GB/s of bandwidth to main memory.
On the other side of the North Bridge there's the CPU's FSB interface, which offers 10.8GB/s of bandwidth in each direction (21.6GB/s total). You can see the serial FSB laid out in the image below:
The North Bridge also features a 500MB/s interface to the Xbox 360's South Bridge, which was designed by SiS (pictured below).
Once again, you don't see any non-Microsoft logos on any of these chips. It's clear this time around who the IP belongs to. The South Bridge is responsible for communication with the audio codec, storage devices, USB ports, controllers, and any other I/O devices.
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Penth - Thursday, November 17, 2005 - link
In response to your second point, the XBox360 does include support for Windows Media center. That is my main point of interest as well. The latest update rollup for windows media center 2005 (was released just over a month ago) adds support for the xbox360. Notice in the picture of the remote it also has the green button.LoneWolf15 - Friday, November 18, 2005 - link
According to what I've read, that's support for a Windows Media Center PC attatched to it, not the ability to run Windows Media Center.. That's not really what I want. I want to be able to hook the thing up to a TV, insert a CD or DVD with DivX content on it, and just play back that way. Still not clear if I can do that.
Ecmaster76 - Wednesday, November 16, 2005 - link
I demand further disassemblage of the DVD!Check and see if it is a single chip SATA logic or a bridged soulution please. If its the former, I predict a surge in availability of cheap, (oem?) SATA DVD-ROMs.
Which is good news for people who like cable management or own a newer Intel mothernoard.
Xenoterranos - Thursday, November 17, 2005 - link
I was dissapointed in the RAM being soldered to the board. I was looing forward to ramming a couple gig-sticks in there.Griswold - Thursday, November 17, 2005 - link
Open case - ramm a couple sticks in - close case - shake it - done.Googer - Wednesday, November 16, 2005 - link
I went to my local Worst Buy and played call of duity 2. The graphics were cr*p with no anti-aliasing. If this is any indication of what to expect from this console then PC games and their players should have little to worry about.dj 315 - Wednesday, November 16, 2005 - link
Still it seems most have been set up incorrectlynyquistcapital - Wednesday, November 16, 2005 - link
Thanks for the close up shot of the South Bridge device. Can you provide more close ups of the 208PQFP directly above the GPU, and the other component to the left of the GPU, past the 2x DDR.Really cool stuff guys!
lymz - Wednesday, November 16, 2005 - link
The capacitors in the pictures look an awful lot like the ones that Dell and Apple are having problems with. Perhaps something worth investigating...kilkennycat - Wednesday, November 16, 2005 - link
Seems as if a fan failure (or blockage of the inlet air passage) could potentially cause catastrophic failure of the critical silicon without effective thermal protection.Anand, Kris, Tuan:-
Any idea of the nature and effectiveness of the thermal protection -- or wanna carry out a potentially destructive test by blocking up the inlet air on your presumably-rare Xbox360? An important issue for the TYPICAL technically-naive purchaser of the Xbox360, who is likely to be very careless about the Xbox360 ventilation and certainly will forget to regularly clear the inlet air-holes of sticky crud and junk. And what about the close-packed-finned heat-sink on the CPU? Such heat sinks on PC CPUs fill up completely with lint after about 6-9 months in a typical home environment. The Xbox360 is DELIBERATELY built to be non-user accessible for cleaning or any other purpose. A very big mistake. The internal air-duct should have been built on to a user-removable cover to expose the heat-sinks and fans for routine cleaning. I have had my share of cleaning out PCs that have become completely blocked up with crud, the first obvious symptom being erratic shut-down of the CPU by the motherboard thermal protection. The Xbox360 dissipates a lot of power in the core silicon --- much more than the old Xbox.
At present, I highly recommend taking a 2-year extended replacement warranty on the Xbox360, so that WHEN ( not IF) the heat-sinks fill up with junk (or the fans fail) and the box begins to function erratically, the owner can get a brand-new one :-) :-) :-)