MONSTER 8x 170HX 64GB X16 LANES SERVER IS ALIVE!
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I finally got all 8 of my capacitor-modded CMP 170HX GPUs back, and today we're putting all eight of them into one server to see if the PCIe Gen 2 x16 modification really works!
These CMP 170HX 8GB cards have been modified with the capacitor mod to unlock PCIe Gen 2 x16 instead of the normal Gen 2 x4 configuration. That means we're potentially getting roughly 4X the PCIe bandwidth.
In this video, I build out the server with:
• 8x capacitor-modded CMP 170HX GPUs
• PCIe Gen 2 x16 on all 8 GPUs
• Dual Intel Xeon Gold 6152 CPUs
• 384GB DDR4 ECC memory
• 4TB NVMe SSD
• CMP 170HX 64GB unlocker
• Ubuntu
• NVIDIA drivers
• NVBandwidth testing
• Memory testing
• GPU burn testing
The results are pretty interesting.
The CMP 170HX cards were able to reach around 6.8 GB/s host-to-GPU bandwidth, compared with roughly 1.4 GB/s on the stock Gen 2 x4 configuration.
I also tested all eight GPUs individually with memory tests and GPU burn. All eight cards passed, with each GPU reaching around 252.9 TFLOPS during the burn test.
Now the big question is whether the additional PCIe bandwidth actually makes a significant difference in real-world AI workloads and LLM inference.
I also want to eventually test this entire 8x CMP 170HX server on Vast.ai and see how well these 64GB GPUs perform when rented for AI workloads.
And there's potentially even more coming. A newer fuse-burn method may be capable of unlocking Gen 3 x16, so if that becomes sufficiently tested and safe, I'll experiment with it in the future.
Comment below: Do you think the CMP 170HX PCIe x16 modification is worth doing?
I'll also be choosing a winner for some Brains hash rate from the comments!
Not financial advice. Mine and invest within your means.
Chapters
00:00 8x CMP 170HX GPUs Are Back
00:53 What Is the CMP 170HX Capacitor Mod?
01:14 Building the 8-GPU Server
02:04 384GB DDR4 + Dual Xeon Gold CPUs
04:16 All 8 CMP 170HX GPUs Installed
05:07 Setting Up Ubuntu & the 64GB Unlocker
05:23 How Much PCIe Bandwidth Can We Get?
06:01 All 8 GPUs Running PCIe Gen 2 x16
06:25 Stock Gen 2 x4 vs Gen 2 x16 Bandwidth
07:14 Host-to-GPU Bandwidth Results
07:54 What Happens With Bidirectional Transfers?
08:51 Does PCIe Bandwidth Matter for AI?
09:20 6.83 GB/s vs 1.43 GB/s
09:57 Memory Tests & GPU Burn
10:24 Could This CMP 170HX Server Make Money?
10:32 8x CMP 170HX on Vast.ai
11:12 Does It Need 768GB of System RAM?
11:50 Can CMP 170HX Reach PCIe Gen 3 x16?
12:08 Thanks for Watching!
#CMP170HX #NVIDIA #AIShow More
MONSTER 8x 170HX 64GB X16 LANES SERVER IS ALIVE!
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