IBM T40p - Under the Hood

The IBM ThinkPad T40p is a slightly different beast than the T40, as the specifications show. Apart from the higher resolution display (SXGA+ vs XGA) and larger capacity battery discussed earlier the T40p comes standard with a faster processor (1.6GHz vs 1.5GHz), a higher performance video part (ATI Mobility FireGL 9000 vs ATI Mobility Radeon 7500), more memory (512MB vs 256MB), and Bluetooth.

The processor and mounting solution in the T40p is the same as that in the T40 with the exception of the speed. The T40p processor runs at 100MHz faster than the processor in the T40. The chipset also remains the same with the chips mounted in exactly the same positions.

The heatsink and fan solution used in the T40p is slightly different than the one used in the T40. The T40p's heatsink contains a total of three heat pipes, with one extending further out on the heatsink surface than the other two. What this is used to cool we will discuss in a moment, but for now note that this is the only difference in the cooling solution used in the T40p. The fan remains the same as does the remainder of the heatsink. This means that, like the T40's cooling solution, the T40p's fan remains off for the most part and is near silent even while running.

The flip side of the heatsink shows that the CPU surface is still bonded to the heatsink via thermal grease. It also shows that there is a thermal pad over the heatsink extension.

The extra portion of the heatsink is used to cool, you guessed it, the Mobility FireGL 9000 video chip. Since the Mobility FireGL 9000 is pin compatible with the Mobility Radeon 7500, IBM is not forced to rework the entire motherboard to accommodate a higher performance video part (a quality ATI likes to call FLEXFIT). IBM also did not have to turn to a replaceable video card solution like the one used in the Dell unit because the NV28M is not compatible with other NVIDIA products. The result is a high performance video chip in a thin and light notebook; something almost unheard of to date.

The Mobility FireGL 9000 is the workstation equivalent of the Mobility Radeon 9000, making the IBM T40 one fast notebook in 3D applications and games. For size requirements IBM uses a memory on package version of the Mobility FireGL 9000 fulfilling a prophecy we wrote about in our ATI Mobility Radeon 9000 review seven months ago:

The memory on chip Mobility Radeon 9000 will likely find its way into thin and light notebooks. Next year ATI predicts that we will see a Mobility Radeon 9000 S64 running in a thin and light notebook with a Banias processor under the hood. If this proves to be the case, mobile gaming will enter a place it has never been before: in the thin and light segment.

The chip runs at a 250MHz core clock speed and 200MHz DDR (400MHz effective) memory clock speed which puts it at the exact same speed at the desktop Radeon 9000.

Another distinguishing factor of the T40p is the amount of memory it ships with: 512MB to be exact. The memory is located all on one SODIMM slot, leaving the user accessible expansion slot free for future upgrades.

The only item on the T40p that makes the unit not a Centrino notebook like the T40 but a Pentium M solution is the wireless card that IBM decided to go with. The T40p makes use of a Philips PH11107 dual band wireless card. The dual band capabilities of this card mean that it is able to operate on both 802.11b as well as faster 802.11a (54 Mbps) networks. Frankly IBM went with this mini-PCI wireless card over the Intel solution because it is more robust: the Intel wireless card offers only 802.11b capabilities. Again the notebook makes use of both antenna connections.

Another thing which sets the T40p apart from the T40 is its Bluetooth capabilities. The T40p uses an Actiontec BMDC200 combination 56kbps modem and Bluetooth transmitter/receiver. It is amazing to see that Bluetooth solutions have shrunk in size enough to make them fit on the same expansion card as a 56kbps modem. An antenna connection comes off the bottom of the modem/Bluetooth card and runs up into the LCD border.

The remainder of logic components on the top of the motherboard remain the same, including the AC'97 codec, Super I/O controller, and Gigabit ethernet controller used in the T40.

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Also the same is the back of the motherboard.

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As is the hard drive used.

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IBM ThinkPad T40 - Under the Hood The Test


View All Comments

  • builda - Thursday, February 02, 2006 - link

    There appears to be a wide spread fault with the Gigabyte NB-1401 model notebook, where it reports having system disk errors or cannot find the hard disk. We have 7 of this model notebook and now 6 of them have reported the same problem. After running chkdsk to temporarily repair the errors that had been caused on the harddisk I found the problem returned the escalated to the point the harddisk could not be found. I further checked using Hitachi drive fitness testing tool which reported a cable error on each machine. Originally I returned 3 of these for repair as they were just outside the warranty period and the supplier checked with Gigabyte with the fix being to rub the cable all over with an eraser!! This worked for a short period but the problem has returned a couple of months later and has spread (like a virus) it now affects 6 out of the 7 notebooks. The supplier has just gone into administration and my next step is to approach Gigabyte who's support service has been found to be extremely unresponsive in the recent past. Reply
  • dbiberdorf - Tuesday, July 27, 2004 - link

    I beg to differ with the reviewer. The keyboard on this unit is mediocre, and the track stick buttons are an abomination. They sit too low in the case and have too much travel. It makes my thumbs hurt after a while, and I often have to press them with a finger to get them to activate fully.

    The most powerful notebook in the world loses big points in my book if they built-in keyboard and pointing devices are weak. Certainly it's the case here. Dell, please figure out how to buy good keyboards for your machines!

    Finally, the power adapter, while featuring convienent wrap-around cabling, is phenomenally large. My cordless phone at home is smaller. With the large profile of the machine, the adapter has to go in a side pocket of the carrying case, adding a little more bulge to your day.
  • visibilityunlimited - Thursday, October 30, 2003 - link

    Screen resolution beyond SXGA+ would be unreadable using Windows for example while being more readable using Linux.

    Both the Linux text console and graphics mode X-windows-system screen drivers can be fully customized to display text at any resolution. The text characters could easily be displayed with current software at 1200dpi or more (if only the graphics processors and monitors could operate at that speed) and still retain the current character size. Text can currently be generated from vector based Type I and TrueType fonts for rasterizing at any resolution. Image scaling is a different and very easy problem.

    The Windows OS is the real culprit holding back general usage of higher resolutions and typeset quality displays because of the OS being handicapped by the inertia of antique display modes. Darn. I want 3200x2400 or more!

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