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Want 8‑core performance on a budget? “Frankenstein” processors offer desktop‑class power from modified laptop chips. These unique CPUs can deliver impressive performance for a fraction of retail prices, but they require technical skills and come with significant risks.
This comprehensive guide covers everything you need to know about running modified processors on LGA1151 motherboards — from compatibility and installation to performance expectations and buying advice.
What are Frankenstein Processors?
Frankenstein processors (also called mutants) first appeared for socket 1150, but LGA1151 saw the peak of their popularity.
These models were originally designed for laptops using BGA1440, but aftermarket manufacturers adapted them for desktop motherboards using special interposer/adapter boards. There are Frankensteins built on all “native” 1151 architectures: Skylake, Kaby Lake, and Coffee Lake (Refresh).
The main advantage of such CPUs is the ability to get strong performance for little money. However, this topic has a high barrier to entry: Frankensteins won’t work out of the box — you must first modify the motherboard BIOS and then flash the modified BIOS (in most cases this requires a programmer, which raises the skill requirements). The physical installation in the socket is also more involved than with retail models, but you don’t need a pin‑mod as in a regular Coffee Mod build.
Who Should Consider Frankenstein Processors
Suitable for:
- Experienced enthusiasts comfortable with a soldering iron and SPI programmer
- Those who want maximum performance per dollar
- Experimenters and tinkerers
NOT suitable for:
- Beginners without modification experience
- Owners of incompatible boards (B360, H310, H370, Q370, and Z390)
- Mission‑critical work systems
- Those who want “install and forget”
What you need to know about Frankensteins
- Both final and engineering versions of processors are modified. Regardless of version, there’s no 100% guarantee a Frankenstein will work on a specific board.
- Most popular models now come in two variants: bare die (without IHS) and with an aftermarket IHS (custom lid). In both cases you’ll need to remove the stock socket retention frame for installation.
- Unlocked‑multiplier models can be overclocked on any motherboard, regardless of chipset. Memory OC is also possible. This is because these chips were designed for laptops and lack some desktop IMC/OC restrictions. On some boards you can OC via BIOS; on others — via tools like Intel XTU or ThrottleStop. Note: overclocking on boards not designed for such loads can be risky.
- Most models have modest nominal TDP (35–45 W), but real consumption can be much higher — especially on unlocked parts. A well‑overclocked 8‑core can exceed 200 W under heavy load and will require high‑end cooling.
- Some models have IMC‑enforced RAM limits (e.g., many Xeon‑based Frankensteins top out at 2666 MHz).
- Models without such limits often struggle with memory OC. Expect to spend time tuning timings to reach what retail desktop parts do in a few clicks. In rare cases 3000–3200 MHz is possible, but 2600–2800 MHz is typical. Final versions tend to handle slightly higher frequencies than ES.
All models and their specifications
Manufacturers have mastered production of such CPUs, and there’s no apparent shortage of donor chips — enabling a large number of models based on both retail and engineering mobile parts.
Engineering versions
| MODEL | Closest Retail Equivalent | Architecture | Stepping | Cores \ Threads | Base Frequency | Max Turbo Boost Frequency | L3 Cache | TDP | Multiplier | Graphics |
|---|---|---|---|---|---|---|---|---|---|---|
| QPH7 QHR7 | - | Sky Lake, 14 nm | Q0 | 4 \ 8 | 1600 MHz | 2600 MHz | 8 MB | 35 W | Locked | HD Graphics 530 |
| QHPW | - | Sky Lake, 14 nm | Q0 | 4 \ 8 | 2200 MHz | 3000 MHz | 8 MB | 45 W | Locked | HD Graphics 530 |
| QL3X | Core i7-7820HK | Kaby Lake, 14 nm | A0 | 4 \ 8 | 2400 MHz | 3500 MHz | 8 MB | 45 W | Unlocked | HD Graphics 630 |
| QL2X | Core i7-7820HK | Kaby Lake, 14 nm | A0 | 4 \ 8 | 2700 MHz | 3800 MHz | 8 MB | 45 W | Unlocked | HD Graphics 630 |
| QNCT | Core i7-8850H | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2400 MHz | 3600 MHz | 9 MB | 45 W | Locked | UHD Graphics 630 |
| QNVH | Core i7-8850H | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2000 MHz | 3600 MHz | 9 MB | 45 W | Locked | UHD Graphics 630 |
| QRRZ QP87 | Core i7-8750H | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2200 MHz | 4100 MHz | 9 MB | 45 W | Locked | UHD Graphics 630 |
| QP87 | Core i7-8750H | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2200 MHz | 4100 MHz | 9 MB | 45 W | Locked | UHD Graphics 630 |
| QQLT | Core i9-9850HK | Coffee Lake, 14 nm | P0 | 6 \ 12 | 2400 MHz | 4100 MHz | 12 MB | 45 W | Unlocked | UHD Graphics 630 |
| QQLS | Core i9-9880HK | Coffee Lake, 14 nm | P0 | 8 \ 16 | 2100 MHz | 4400 MHz | 16 MB | 45 W | Unlocked | UHD Graphics 630 |
| QS0P | Core i9-9980HK | Coffee Lake, 14 nm | R0 | 8 \ 16 | 2300 MHz | 4800 MHz | 16 MB | 45 W | Locked | UHD Graphics 630 |
| QPQG | Core i9-8950HK | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2900 MHz | 4800 MHz | 12 MB | 45 W | Unlocked | UHD Graphics 630 |
| QRZQ | Xeon E-2276M | Coffee Lake, 14 nm | R0 | 6 \ 12 | 2800 MHz | 4700 MHz | 12 MB | 45 W | ? | UHD Graphics 630 |
| QTJ2 | Core i7-9850H | Coffee Lake, 14 nm | R0 | 6 \ 12 | 2400 MHz | 4300 MHz | 12 MB | 45 W | Locked | UHD Graphics 630 |
| QTJ1 | Core i9-9880HK | Coffee Lake, 14 nm | R0 | 8 \ 16 | 2100 MHz | 4600 MHz | 16 MB | 45 W | Unlocked | UHD Graphics 630 |
| QTJ0 | Core i9-9880HK | Coffee Lake, 14 nm | R0 | 8 \ 16 | 2800 MHz | 4700 MHz | 16 MB | 65 W | Unlocked | UHD Graphics 630 |
Final versions
| MODEL | Architecture | Stepping | Cores \ Threads | Base Frequency | Max Turbo Boost Frequency | L3 Cache | TDP | Multiplier | Graphics |
|---|---|---|---|---|---|---|---|---|---|
| SR3YY Core i7-8750H | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2200 MHz | 4100 MHz | 9 MB | 45 W | Locked | UHD Graphics 630 |
| SR3YZ Core i7-8850H | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2600 MHz | 4300 MHz | 9 MB | 45 W | Locked | UHD Graphics 630 |
| SRDEC Core i3-8100B | Coffee Lake, 14 nm | U0 | 4 \ 4 | 3600 MHz | 3600 MHz | 6 MB | 65 W | Locked | UHD Graphics 630 |
| SRCX3 Core i5-8500B | Coffee Lake, 14 nm | U0 | 6 \ 6 | 3000 MHz | 4100 MHz | 9 MB | 65 W | Locked | UHD Graphics 630 |
| SRCX2 Core i7-8700B | Coffee Lake, 14 nm | U0 | 6 \ 12 | 3200 MHz | 4600 MHz | 12 MB | 65 W | Locked | UHD Graphics 630 |
| SRF6X Core i5-9300H | Coffee Lake, 14 nm | U0 | 4 \ 8 | 2400 MHz | 4100 MHz | 8 MB | 45 W | Locked | UHD Graphics 630 |
| SRFD0 Core i9-9980HK | Coffee Lake, 14 nm | R0 | 8 \ 16 | 2400 MHz | 4900 MHz | 16 MB | 45 W | Unlocked | UHD Graphics 630 |
| SRF6U Core i7-9750H | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2600 MHz | 4500 MHz | 12 MB | 45 W | Locked | UHD Graphics 630 |
| SRFCP Core i7-9750H | Coffee Lake, 14 nm | R0 | 6 \ 12 | 2600 MHz | 4500 MHz | 12 MB | 45 W | Locked | UHD Graphics 630 |
| SR32K Xeon E3 1505M v6 | Kaby Lake, 14 nm | B0 | 4 \ 8 | 3000 MHz | 4000 MHz | 8 MB | 45 W | Locked | HD Graphics P630 |
| SRFCZ Xeon E-2286M | Coffee Lake, 14 nm | R0 | 8 \ 16 | 2400 MHz | 5000 MHz | 16 MB | 45 W | Locked | UHD Graphics P630 |
| SRFCK Xeon E-2276M | Coffee Lake, 14 nm | R0 | 6 \ 12 | 2800 MHz | 4700 MHz | 12 MB | 45 W | Locked | UHD Graphics P630 |
| SRCKQ Xeon-E 2186M | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2900 MHz | 4800 MHz | 12 MB | 45 W | Locked | UHD Graphics 630 |
| SR3YX Xeon-E 2176M | Coffee Lake, 14 nm | U0 | 6 \ 12 | 2700 MHz | 4400 MHz | 12 MB | 45 W | Locked | UHD Graphics 630 |
Top 5 Most Interesting Models
- QNCT / QNVH. 6‑core with locked multiplier. Good for entry‑level boards with weak VRM.
- QQLT. 6 cores for overclocking. Solid option for mid‑range boards.
- QQLS. 8 cores for overclocking. Similar to Core i9‑9900K performance, but on older P0 stepping. For boards with strong power delivery.
- QTJ0 / QTJ1. Close to QQLS, newer stepping, typically reach slightly higher clocks. For users targeting maximum OC.
- SRFD0. Final 8‑core (Core i9‑9980HK). Makes sense if, beyond high core clocks, you also want better RAM OC potential.
Compatibility
Initially, running Frankensteins was risky, but over time enthusiasts refined methods and tooling. Current compatibility looks like this:
Owners of B360, H310, H370, Q370, and Z390 boards are least fortunate — chances of success are minimal. If you have one of these, consider alternatives like Intel CC150, which works out of the box on 300‑series chipsets.
Operation is not guaranteed on OEM boards regardless of chipset. Some ASUS 100/200‑series boards require preliminary BIOS settings. Most other retail boards can fully utilize modified CPU capabilities.
How to run Frankensteins on 1151 boards
BIOS preparation
There are two ways to obtain a modified BIOS: make it yourself or get one from sellers (for popular boards you can often find ready‑made BIOS builds online).
Brief guide using CoffeeTime 0.99:
- Prepare a BIOS dump. Either extract from your board (preferred if you want to keep MAC address and board data) or download from the manufacturer’s website.
- Download CoffeeTime_0.99.
- Open the BIOS dump in the program — you’ll see the main interface.
- Change Intel ME from Consumer to Corporate and disable it. Available versions: Corporate 11.7.0.3307 and 11.8.77.3664. For ASUS boards, 11.7.0.3307 is recommended due to possible bricking when downgrading ME later. If no downgrade is planned, and for other vendors, 11.8.77.3664 is recommended.
- After changing the version, disable ME using the toggle/button.
- (Optional) Update vBIOS and GOP versions.
- Apply all available patches — once applied, they should turn green.
- Ensure the BIOS contains required CPU microcodes and add any missing ones. Quick reference below.
- Transfer board‑specific data (optional). For example, MAC address (and DMI data on some ASUS boards).
- (Optional) On the “EXTRA” tab, apply vendor‑specific patches (notably MSI/Clevo) and set memory frequency to 2133 MHz to avoid RAM issues on first boot.
- Save the modified BIOS. Proceed to flashing.
BIOS flashing
Some boards can be flashed via software (often MSI and Gigabyte), but in most cases you’ll need a programmer and the skills to use it.
Even if your board supports software flashing, it’s wise to have a programmer — it’s useful for recovery and future projects. A simple CH341A works; more advanced options include RT809H or TL866II Plus. Note: some SPI flash chips require a 1.8 V adapter.
We can’t provide universal flashing instructions — details vary by vendor and specific board. If the process seems daunting, consider a professional service center.
Processor installation
Correct installation requires removing the stock socket retention frame and mounting the processor with the specialized screws included in the kit. Keep your original socket hardware safe in case you return to standard desktop CPUs. Align the package carefully; avoid tilting or uneven screw pressure.
Boot and testing
Perform the first boot with a single memory module at JEDEC speed. The system may restart several times — this is normal, and first boot can take a while.
If you get a prolonged black screen, power down, recheck CPU seating and contact, and clear CMOS before retrying.
Possible problems
The most common cause is poor CPU contact in the socket. Symptoms include a missing memory channel, PCIe issues, instability, or a black screen. Solution: reseat the CPU; ensure even screw tension and cooler pressure.
The next common cause is BIOS configuration. Try a different Intel ME Corporate version; verify required microcodes are present. In some cases, starting from a different stock BIOS version helps.
Where to buy
Main platforms:
- AliExpress — most popular choice
- Taobao via intermediaries (more options, better prices)
- eBay — also a viable option
Conclusion
Frankenstein processors offer an exciting way to achieve high‑end performance on a budget, but they’re not for everyone. Installation requires technical skills, specialized equipment, and carries real risk of hardware damage.
If you have the expertise and compatible hardware, these modified processors can deliver excellent price‑to‑performance. For most users, safer alternatives like Intel CC150 or retail CPUs may be the better choice.