Ruplikmastik666 from Discord recently did a review of the new TUL Backplate on his BCU-1525.

The review is divided into 3 parts:

  • Backplate only
  • Backplate + Fan
  • Backplate + Immersion

PART 1: Backplate Only ❄️

ruplikmastik666 did a quick test using the latest whitefire990 bitstream. He compared running it using his modded stock backplate and the TUL backplate. His custom backplate is a stock backplate with a custom heatsink installed and is already about 6/8oC cooler than a stock backplate without mods.


Backplate Clock Frequency Voltage Power Regulator Temp
Stock 580MHz 0.88v 96.9oC
Modded 580MHz 0.88v 89.9oC
TUL 580MHz 0.88v 78.4oC

Left hand side photo is using ruplikmastik666's custom backplate. Right hand side photo is using the new TUL backplate.

Impressive. The TUL backplate keeps the power regulators about 10/12oC colder! And that's compared to my modified backplate. So compared to a stock backplate it should be about 20oC colder.

Based on his results, the TUL Backplate is 10-12oC cooler than his custom backplate, which is already 6-8oC cooler than the stock backplate.

This means that compared to a stock backplate, the new backplate is estimated to make your power regulator 20oC colder!  

Lower chip temperatures have a lot of benefits.  

  1. Extend longevity of your FPGA board 👴🏻
  2. Reduce risks of chip and board burnout 🔥
  3. Less board crashes from PWM overheating 🌡
  4. Run more powerful bitstreams, aka more revenue 🚀

PART 2: Backplate ❄️ + Air 💨

Next, ruplikmastik666 did another test using the backplate and air. He tested both on low temperature and power first, then went to high power and temperature.

I tested both the BCU on air. One with an old style 3D printed air duct with a 120mm Orion 250cfm fan and STOCK backplate (I will call this the "stock one") and another with my own custom designed 3D printed air duct with one Orion 250cfm fan and TUL new style backplate (I will call this the "modded one").


Backplate Clock Frequency Voltage Core Temp Power Regulator Temp Inductors Temp
Stock 560MHz 0.755v 60oC 61oC 48oC
TUL 560MHz 0.755v 50oC 61oC 43oC
Stock 600MHz 0.88v 90oC 92.3oC 73.8oC
TUL 600MHz 0.88v 70oC 74.4oC 59.7oC

As you can see the TUL backplate do not makes any difference at low power or low temperatures.

In this case the special air duct made 20oC difference on the core and 14oC on the inductors and the TUL backplate made 18oC difference!!

When tested on low power or temperature, the backplate didn't seem to make much difference. On the other hand, when tested on high power or temperature, the TUL backplate made 18oC difference 🙌

PART 3: Backplate ❄️ + Immersion 🚰

Lastly, ruplikmastik666 built an impressive immersion system. In the set-up below, he is testing Whitefire's private 12 cores bitstream at the MAX possible voltage: 88A and 0.93v.


Backplate Clock Frequency Voltage Core Temp Power Regulator Temp Inductors Temp
TUL 630MHz 0.93v 58.1oC 76.9oC 60.1oC

Results and Set-Up of the Immersion System

The backplate is the new TUL one which is WAY superior compared to the stock one... Considering the price that it costs it's really a MUST for any BCU1525 owner!

The backplate results look really good while running this core-intensive bitstream on the BCU1525. We can conclude that TUL's backplate increases board's lifetime and reduces board overheating 🌡 , which means you can run faster ⚡️and heavier 🏋 bitstreams which will generate more mining revenue 💰💰💰