While this build is very similar to alesso13's T734 build, I've included the DSDT files for the repository, and broke a speed record 😎
This system sets a new record for EC2 2Gbps performance: 193.4MB/s! That's almost 24MB faster than the current record of 169.8. Admittedly, it's like the top speed in a go-cart when everyone else has a supercar.
Fujitsu T734, 12GB RAM.
CPU: Intel i5-4200M
iGPU: Intel HD4600
Adapter: EXP GDC 8.5c with ExpressCard Adapter
GPU: Sapphire R9 280X
PSU: Aspire Venus 450W. If I built this again I'd get the 500W since it comes with an 8pin PCI-E connector, Molex->8 pin converters are pricey! (relative to a $26 power supply)
Outside of Error 12, the setup is plug-n-play.
All benchmarks done at 1080p using an external monitor.
Memory write is 193.4 MB/s or 1547.2Gbps, which is the highest 2Gbps link score to date.
The Expresscard adapter permits for hotplugging, which is a much welcome feature from my Chromebook eGPU experiences.
Fujitsu Lifebooks are my favorite secret weapon when it comes to low-cost, moddable systems that are surprisingly capable. This particular T734 cost under $100.
Unlike the Chromebook monstrosity, this actually has a purpose. A buddy needed a useable Blender system, and this is a pretty good one...at least until I realized that AMDATI support in Blender starts one generation above the 280X 🙁
Oh well. It plays most modern video games, so the buddy'll use it for speedrunning.
Thank you. Your 4th-gen CPU is 4Gbps-EC2 capable, doubling your current measured performance.
The eGPU works but performance is poor, stuttering
Proceed to optimize your configuration by:
1. Attach an external LCD instead of accelerated internal LCD mode (Optimus) to ensure bandwidth is dedicated to eGPU rather than display rendering traffic. There display traffic goes straight out to the HDMI/DP/DVI connector.
2. Disable the eGPU audio device and use the notebook inbuilt speaker. Again to ensure the bandwidth is dedicated for eGPU traffic.
3. Ensure your link is running in Gen2 mode (2nd-5th Gen i-core) or Gen3 8Gbps (6th Gen i-core or newer).
In GPU-Z click the "?" next to Bus Interface to perform a render test. This will take the eGPU out of lower power x1 1.1 Gen1 mode and (usually) switch to x1 2.0 (Gen2) mode. If it still remains in x1 1.1 mode then you can uprate your link from Gen1 to Gen2 using BIOS options or nando's eGPU Setup 1.35
4. Set NVidia Inspector 'Frame Rater Limiter V2' to 59 or 60Hz, matching your external LCD. This will prevent the eGPU rendering redundant images.
@nando4, Thank you for the info!
I have your fantastic eGPU Setup 1.35 , it's been essential in debugging. The 734 started spewing out Error 12s again, so I most likely need to do PCI compaction in addition to the DSDT. It's crazy because the 280X is an extremely fickle card, while my primary egpu card (RX 5700 XT) has no problems whatsoever.
When I have a chance to work with the laptop again, I'll try to get 4Gbps EC2 activated.