Quick Verdict
An extraordinarily fast but impractical CPU: stellar clocks and multi-threaded performance for its era, but extreme power draw, no warranty, and near-zero availability make it a collector’s item rather than a practical purchase.
Overview
Launch
2019
Status
End-of-lifeGeneration
9th Gen X-Series (Core i9 Extreme)
Market
High-End Desktop / Workstation
The Intel Core i9-9990XE is a 14-core, 28-thread high-end desktop processor based on a binned Skylake-X HCC die, offering 4.0 GHz base and up to 5.1 GHz turbo clocks on a 255 W TDP, sold exclusively via OEM auctions with no warranty and extremely limited availability.
Intel took its 18-core Skylake-X HCC die, disabled four cores, and aggressively binned the remaining 14 for 4.0 GHz base and 5.0–5.
1 GHz all‑core turbo, resulting in a 255 W HEDT part with 44 PCIe 3.0 lanes and quad‑channel DDR4‑2666. It was never sold at retail; instead Intel auctioned trays to OEMs and system integrators once per quarter, with no warranty and extremely limited supply.
That makes it fast but risky and hard to recommend outside very niche scenarios.
Specifications
Performance
Very strong multi-threaded performance for Adobe apps, rendering, and simulation workloads, competitive with or slightly ahead of the 18-core i9-9980XE in some tests.
Good for running several VMs thanks to 14 cores and quad-channel memory, but high power draw and lack of warranty are concerns for 24/7 use.
Capable of high-refresh-rate gaming thanks to strong single-core clocks, but modern gaming-focused CPUs often deliver better minimums and efficiency at far lower cost.
Extremely low efficiency; 255 W TDP at base frequency and much higher real power draw under all-core boost makes it one of the most power-hungry HEDT CPUs of its era.
- •High clock speeds give strong single-threaded performance for high-refresh-rate gaming.
- •14 cores are underutilized in most games, which favor fewer faster cores.
- •Modern gaming CPUs (e.g., 13th/14th Gen Core i9, Ryzen 7000) often deliver better gaming performance per watt and per dollar.
- •No dedicated AI or matrix hardware; AI workloads rely on AVX-512 and CPU-based inference.
- •Suitable for small-scale CPU inference and prototyping, but not competitive with modern NPUs or GPUs.
Architecture
14 nm
Process Node
Skylake-X
Codename
14C / 28T
Core Config
19.25 MB
L3 Cache
255 W
TDP
Architecture Overview
The Core i9-9990XE uses Intel’s Skylake-X microarchitecture on a 14 nm HCC (High Core Count) die that physically supports up to 18 cores. For this SKU, Intel disables four cores and bins the remaining 14 for higher frequencies, yielding a 14-core/28-thread part with 19.25 MB of shared L3 cache and 1 MB of L2 per core.
CPU Design
14 physical cores with Hyper-Threading, organized as a binned HCC die. The L1 cache is 32 KB instruction + 32 KB data per core (14×32 + 14×32 KB total), and each core has a 1 MB private L2 slice, with a 19.25 MB shared L3 slice across all cores.
Memory Subsystem
Integrated quad-channel DDR4 memory controller with official support for DDR4-2666; practical builds using 32 GB DIMMs can reach 128 GB of RAM, which is beneficial for large compositing and rendering tasks.
PCIe & I/O
44 PCIe 3.0 lanes sourced directly from the CPU, typically feeding multiple GPUs and NVMe SSDs on X299 motherboards, with additional lanes provided by the X299 chipset.
Overclocking
Unlocked multiplier allows easy frequency tuning; however, the 255 W TDP and extreme heat output at 5.0+ GHz all-core mean only very robust cooling and high-end motherboards can sustain these clocks.
- Significantly higher all-core turbo (5.0 GHz vs 4.5 GHz on i9-9940X)
- Better binned silicon for sustained high-frequency operation
- Higher single-threaded performance due to 4.0 GHz base vs 3.3 GHz on i9-9940X
Key Highlights
- 14 cores and 28 threads with strong multi-threaded throughput
- Up to 5.1 GHz single-core and 5.0 GHz all-core turbo for its generation
- 44 PCIe 3.0 lanes for multi-GPU and storage expansion
- Quad-channel DDR4-2666 with support for up to 128 GB RAM
- Unlocked multiplier for enthusiast overclocking
- Highly binned silicon with STIM for improved thermal transfer
- Extremely high 255 W TDP and real-world power draw far above that under load
- No warranty from Intel and no guaranteed availability
- Auction-only distribution makes it virtually unobtainable for normal users
- Old 14 nm process and platform with no upgrade path beyond X299
- Outperformed by newer CPUs in efficiency and often in raw performance per dollar
History
The Core i9-9990XE emerged in early 2019 as an ultra-low-volume experiment in Intel’s HEDT lineup. Based on the same 14 nm Skylake-X HCC die as the 18-core i9-9980XE, Intel disabled four cores and aggressively binned the remaining 14 for 4.0 GHz base and 5.
0–5.1 GHz turbo, pushing TDP to 255 W. Rather than offering it through normal retail channels, Intel sold trays via quarterly online auctions open only to OEMs and system integrators, with no warranty and no fixed public price.
The CPU was positioned as a solution for financial-services customers who needed maximum clock speed on a familiar X299 platform, but its extreme power draw, heat, and lack of warranty led some system builders, including Puget Systems, to avoid it despite benchmark leadership in several Adobe applications. Over time, the i9-9990XE became a curiosity: a halo product that demonstrated Intel’s ability to bin high-frequency silicon, but one that was almost impossible for enthusiasts to actually buy.
Improvements over Previous Generation
- Significantly higher all-core turbo (5.0 GHz vs 4.5 GHz on i9-9940X)
- Better binned silicon for sustained high-frequency operation
- Higher single-threaded performance due to 4.0 GHz base vs 3.3 GHz on i9-9940X
Alternatives & Competitors
Should You Buy It?
Not Recommended for the right buyer
Boutique workstation integrator with existing X299 inventory and a specific need for the highest possible clocks on 14 cores, regardless of cost or warranty.
Avoid if…
- Building a new PC from scratch in 2026
- You care about power efficiency or cooling noise
- You want any warranty or long-term support
- You are not a system integrator who can actually obtain the chip via auction
Use Cases
Interesting Facts
The i9-9990XE was never listed in Intel’s public ARK database and was only visible through leaks and OEM documentation.
Intel designed it specifically for financial-services workloads that prioritize clock speed over core count.
System builder Puget Systems publicly declined to sell systems with the i9-9990XE due to lack of warranty and extreme heat, despite it being the fastest CPU in some Adobe tests.
The CPU uses the same HCC die as the 18-core i9-9980XE but with four cores disabled, allowing Intel to harvest partially defective but high-frequency parts.
Retailers like CaseKing once listed it for around €2,999 (~$3,400), far above Intel’s suggested tray prices for other X-Series CPUs.
Intel’s own documentation described it as a limited-quantity, auction-only part to ensure fairness in distribution among OEMs.
At 5.0 GHz all-core on 14 cores, it could draw over 400 W under load, requiring robust VRM and liquid cooling.
It supports AVX-512, which was relatively rare on client CPUs at the time, giving it an advantage in some scientific and financial workloads.
Enthusiast builder 8Pack used the i9-9990XE in a limited-edition Supernova XL showpiece system, underscoring its status as a halo product.
Despite being a 9th-gen CPU, it has no direct successor; Intel later shifted HEDT focus to Cascade Lake-X and then to Xeon W and the Xeon W-3175X platform.
People Also Ask
Is the Intel Core i9-9990XE good for gaming?
It delivers high single-core clocks, so gaming performance is good, especially at high refresh rates, but modern gaming CPUs usually offer better value and efficiency.
Why was the i9-9990XE sold by auction only?
Intel stated it was designed for financial-services customers with specific high-frequency requirements; auctions were used to allocate limited supply among OEMs fairly.
Does the Core i9-9990XE have a warranty?
No, Intel sold it without any warranty, and system builders like Puget Systems warned that failures would be expensive and replacements impossible to guarantee.
How much power does the i9-9990XE use?
It has a 255 W TDP, but under all-core 5.0 GHz workloads it can draw far more, often requiring 400+ W cooling and robust VRMs.
Is the i9-9990XE better than the i9-9980XE?
It trades four cores for significantly higher clocks: it often leads in lightly threaded and some Adobe workloads but trails in heavily multi-threaded tasks compared to the 18-core 9980XE.
Can you buy an Intel Core i9-9990XE new today?
New units are essentially unobtainable through normal channels; occasional listings are extremely expensive and come from old OEM stock, not Intel.
What socket does the i9-9990XE use?
It uses the LGA2066 socket and requires an X299 chipset motherboard.
Does the i9-9990XE support DDR5?
No, it supports only DDR4 memory, officially up to DDR4-2666.
How many PCIe lanes does the i9-9990XE have?
It provides 44 PCIe 3.0 lanes from the CPU, plus additional lanes from the X299 chipset.
Is the i9-9990XE good for content creation?
Yes, especially for Adobe and other clock-sensitive applications, but newer platforms offer similar or better performance with better efficiency and support.
Frequently Asked Questions
What is the Intel Core i9-9990XE?
A rare, 14-core/28-thread Skylake-X HEDT processor with 4.0 GHz base and up to 5.1 GHz turbo, sold exclusively via OEM auctions with no warranty.
Why is the i9-9990XE so expensive on the used market?
Because it was produced in extremely limited quantities and never sold at retail, so remaining units are rare and carry a collector’s premium.
Does the i9-9990XE have integrated graphics?
No, it requires a discrete GPU.
Can I overclock the i9-9990XE?
Yes, it has an unlocked multiplier, but thermals and power delivery are major constraints; only high-end cooling and motherboards can handle significant overclocks.
Is the i9-9990XE still good for video editing?
It remains capable for 4K editing in Premiere and After Effects, but modern CPUs like the i9-13900K or Ryzen 9 7900 offer better performance and efficiency.
What cooling does the i9-9990XE need?
A high-end 280–360 mm AIO or custom loop is recommended; Puget Systems found even a 120 mm AIO with upgraded fans was barely sufficient.
Does the i9-9990XE support AVX-512?
Yes, it supports AVX-512 along with AVX and AVX2, which is useful for certain scientific and financial workloads.
How does the i9-9990XE compare to the i9-9940X?
It has the same 14-core / 19.25 MB L3 configuration but much higher clocks (4.0/5.0 vs 3.3/4.5 GHz), making it faster in most real-world workloads.
Is the i9-9990XE good for virtualization?
It can run several VMs thanks to 14 cores and quad-channel memory, but high power use and lack of warranty are significant drawbacks for 24/7 servers.
Why did Intel make the i9-9990XE auction-only?
To limit supply to select OEMs for niche high-frequency use cases (like financial services) and to create a halo product that generated buzz without disrupting mainstream pricing.