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RD2 PC-Geiger Review
By Bones (Ed T. Toton III)
October 29, 2003
(Review unit not supplied; purchased for use)


The PC-Geiger is a drive-bay device that displays information about your PCI bus in an easily understood and accessible manner. It consists of a bare-metal panel with a red numeric LED display, and a PCI connected PCI card for reading information from your motherboard. It's capable of displaying bus speed in megahertz, as well as bus utilization in kilobytes per second or megabytes per second, or as a percentage. It will also display port 80H/84H boot codes.

Since the PC-Geiger simply monitors the status of the PCI bus and does not otherwise communicate with your system, it is theoretically independant of any particular operating system or software, and does not require anyware, and does not require any later.

This device also comes equipped with front-facing USB ports and a fireware port, that can be connected to your motherboard with included cables. The pin-by-pin connectors for the USB cables allow them to be used on virtually any motherboard.

PC-Geiger PC-Geiger


Installation of the PC-Geiger is very simple. It merely consists of a drive-bay insert, and a PCI card that are connected via a ribbon cable. There are other connectors on the back of the display panel that can be used to connect it's auxilliary LED and switches to certain functions on your motherboard, such as using one of the switches as an externally accessible CMOS-clearing switch. These are completely optional and are intended more for tinkerer's to use for custom projects. To be able to directly use the device for it's primary functions requires only connecting it to the PCI card, which does most of the work.

Upon starting the system, you will immediately see the boot-codes generated on the system bus displayed during POST (Power-On Self-Test). A code of "FF" means that the BIOS (Basic Input/Output System) has handed off control of the computer to the operating system and it is beginning to boot your software.

The "mode" button can now be used to select other statistics to display, such as the percentage of PCI-bus utilization. There are only four modes, including the Port 80H/84H codes (boot codes). Since there is no software to install, you can connect this to a pre-configured machine running any operating system and not be concerned with changing software configurations or interfering with an existing setup. You can also easily migrate it from one machine to another.

PC-Geiger However, there may be a caveat with regards to this software independence. In our the system, we found that under Windows 2000 it operates just fine. However when the same machine (running an AMD XP 2200+ and ASUS A7V8X MB) is booted into Linux (Slackware 9.1 with default kernel), all of the functions of the PC-Geiger are effectively inaccessible, since there are apparently codes constantly being generated on Ports 80H/84H. From what I'm told, the linux kernel outputs data to those ports as IO-delays that are independant of CPU speed. Apparently it's considered one of the few "safe" ports for this use. Unfortunately, the PC-Geiger is designed to display those port codes at the exclusion of all else when they're being generated, despite what you may have selected. We feel this is a serious design flaw; that the PC-Geiger should only monitor and store that information in the background if you've elected to display something else. This flaw can result in the PC-Geiger being effectively useless if you're a linux user. If the PC-Geiger were better about honoring your mode selection, the Linux kernel's activities would be a non-issue.

Unfortunately we don't have an effective way to test the accuracy of this tool's information, since it is currently the only device on the market that we're aware of that performs these functions. The next closest product we know of is the ASUS iPanel, which only shares the ability to display boot codes, and only works with ASUS motherboards.

Ultimately, this device could be a useful diagnostic tool, but will most likely fall to the status of being a geek-toy for those who wish to add a nice large LED display to their computer. It'll most likely be adopted mainly by those who are willing to spend some cash on PC-beautification, and are only concerned with having devices that are marginally useful. It's our feeling that it's targetted audience will mainly be the hard-core geeks and case-modding crowds. As such, if it fails to operate properly under Linux, whose community contains a large fraction of the PC tinkerers, we're not sure how to predict the success of this product.


  • Consists of PCI card + Drive-bay display
  • Displays PCI bus speed in MHz (with optional 2x and 4x multipliers)
  • Measures PCI utilization in MB/s, KB/s, percentage
  • Displays Port 80H/84H information
  • Software and OS independant
  • 2 USB and 1 Firewire port for front access


  • No drivers or system configuration required
  • Large, clear, well-engineered display
  • Easy installation
  • Well engineered


  • Always reports "boot codes" when available, no matter which mode is selected. Makes collecting data under linux impossible without patching the kernel to use a different port for IO delays.


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