Enabling SLI on non-nVidia supported platforms

nvidia-geforce-gtx-battlebox-sli-bridge

Enabling SLI on non-nVidia approved platforms has less of a pain-in-the-ass since nVidia allowed SLI on Intel chipsets, but enabling SLI on a workstation designed to take Quadro cards so it will work with Geforce cards is a little more of a pain in the ass.

In my configuration, I’m trying to enable SLI on an older Dell Precision 690 workstation with an SLI riser card. Normally, nVidia and Dell only allow with very expensive Quadro video cards in this configuration. However, I got myself a pair of GTX260 Core 216 video cards for very cheap and so I wanted to do a little experimenting to get this to work.

Plenty of modifications exist to enable SLI on non-supported configurations, and the solution I chose was DifferentSLI. However, this software patches the nVidia kernel-mode driver and then signs it with a self-signed certificate that obviously isn’t chained to Microsoft’s CA. This means for Windows to load, it has to be put into Test Mode to allow the kernel to accept a self-signed certificate and load the driver.

Since I already had Class 2 validation with StartCom, I embarked on a poorly-documented journey to sign the modified driver file with my Code Signing Certificate from StartSSL and load it, so I wouldn’t have to put Windows into that ever-annoying Test Mode.

Read the write-up here:
http://andrewpeng.net/computing/enabling-sli-on-a-dell-precision-690-with-geforce-video-cards

Continue Reading

Texas Front License Plate Laws

Let me preface this with the fact that I am not a lawyer, nor should anything in this post be taken as legal advice. Use the information provided here at your own risk.

In researching the front license plate law I found a lot of conflicting information on the requirements of how and where the front license plate can be put on a car that is registered in Texas. I spent a few minutes digging around the Internet looking at credible sources of information (such as published Texas laws and statues from the Texas state legislature.

Continue Reading

On USB Flash Drives

Bought another USB flash drive the other day, and suddenly it clicked in my head that I purchased a storage device that was $40, reads and write at well over 100mbyte/sec, and holds 128gbytes, in the palm of my hand.

Benchmarked my old and new drive. Technology has come a long way since 1.44mbyte floppy disks.

Kingston DataTraveler Ultimate 32GB
Sequential read, 1 file, 1024MB: 126MB/sec
Sequential write, 1 file, 1024MB: 82MB/sec

PNY Turbo 128GB
Sequential read, 1 file, 1024MB: 183MB/sec
Sequential write, 1 file, 1024MB: 109MB/sec

 

Continue Reading

Headphone Amp Set in Clear Acrylic

I need to get a headphone amp for my Sennheiser HD280 Pros – maybe this will be my next project. A headphone amplifier assembled “dead bug” style, then set in clear acrylic. Yes. I want one.

Electronic engineers have been encapsulating or potting electronics in resin’s for decades usually for vibration dampening or moisture control its just I decided to make it look presentable 🙂

Source: Rupert Hirst / Runaway Brainz

Continue Reading