Intel Core Ultra 200S · LGA1851 / Dual-tower air cooler
Does the Thermalright Peerless Assassin 120 SE fit the Core Ultra 7 265K?
Yes. The Thermalright Peerless Assassin 120 SE fits the Core Ultra 7 265K with -5 W of thermal headroom; we estimate 96 °C under sustained load and 60 °C while gaming, an acceptable match with fans working hard.
Reviewed by Farrukh Sufyan SarwarHow we estimate temperaturesPublished Prices verified Model v1.2 · data updated
Full load
96°
Gaming
60°
Idle
35°
Acceptable fit
Safe at 96 °C full load
4 °C below the 100 °C junction limit under a sustained all-core load.
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The Thermalright Peerless Assassin 120 SE handles the Core Ultra 7 265K with a 5 W deficit to spare. Expect roughly 60 °C while gaming and 96 °C in Cinebench-style loads, comfortably below the 100 °C limit but with the fans working hard.
Thermal estimate
Both figures assume a 35 °C case-internal ambient and the cooler's sustained rating; the CPU's own junction limit caps the full-load figure.
| Load | Estimate |
|---|---|
| Idle | 35 °C |
| Gaming | 60 °C |
| Full load | 96 °C |
| Junction limit | 100 °C |
- 0–85 % comfortable
- 85–100 % fans ramp
- 100 %+ throttles
- Thermal headroom
- -5 W
- CPU boost / gaming draw
- 250 W / 135 W
- Cooler sustained rating
- 245 W
- Junction limit
- 100 °C
- Cooler height
- 155 mm
- RAM clearance
- 42 mm
- Sockets in the box
- AM4 · AM5 · LGA1200 · LGA1700 · LGA1851
What the numbers mean for this build
- 02
Intel PL2 sustained draw: 250 W
Motherboards commonly remove the Tau window, so treat 250 W as continuous. The Thermalright Peerless Assassin 120 SE has the mass to absorb it; enabling Intel Default Settings in BIOS still helps long-term stability on 13th/14th Gen parts.
- 03
RAM clearance 42 mm
Most heatspreader kits up to 42 mm slide under the front fan without moving it. Check the first DIMM slot on boards with the socket placed close to the memory.
Will it physically fit?
Drag the sliders to your memory height and case limits. The schematic moves with you and shows where the Peerless Assassin 120 SE clashes.
Stock front-fan clearance on the Peerless Assassin 120 SE: 42 mm.
Listed as “CPU cooler clearance” in the case spec sheet. This cooler is 155 mm tall.
- RAM heightClash (-2 mm)
Modules sit 2 mm too tall. Raise the front fan or choose 34 mm low-profile RAM.
- Cooler height vs caseFits (+10 mm)
10 mm between the cooler and the side panel.
Overall Clash for the Peerless Assassin 120 SE with your inputs.
Schematic, not to product scale.
Better options for the Core Ultra 7 265K
Three tiers picked for this exact CPU: the cheapest tower that passes, the quietest liquid option per dollar, and the best low-profile heatsink.
Top air value
$42.39as of Nov 2, 05:59 AM UTC · In Stock
(opens Amazon in a new tab)ThermalrightPeerless Assassin 140
Dual-tower air cooler · 157 mm
30 W of headroom; the best-value tower air cooler that passes on this CPU
Silent liquid pick
~$54
(opens Amazon in a new tab)ThermalrightFrozen Infinity 360
360 mm AIO liquid cooler · 52 mm
Estimated 79 °C under full load with quiet fan curves
Small-form-factor pick
$27.99as of Nov 2, 05:59 AM UTC · In Stock
ThermalrightAXP120-X67
Low-profile air cooler · 67 mm
67 mm tall; best low-profile option, but expect throttling in all-core loads
Not recommended for this CPU
Full analysisProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.
Cheapest upgrades with a better verdict: Thermalright Frozen Notte 360 ARGB V2 ($55.39), Thermalright Peerless Assassin 140 ($42.39), Thermalright Peerless Assassin 140 Digital ($53.09), Thermalright Frozen Infinity 360 (~$54), Thermalright FW360 ARGB (~$59), be quiet! Dark Rock Elite ($84.90).
Related reports
Other coolers on the Core Ultra 7 265K
- Thermalright Phantom Spirit 120 SEAcceptable fit
- Thermalright Phantom Spirit 120 EVOAcceptable fit
- Noctua NH-D15Acceptable fit
- Noctua NH-D15 G2Excellent fit
- be quiet! Dark Rock Pro 5Acceptable fit
- Thermalright Assassin X 120 R SEThrottling risk
- Thermalright AXP120-X67Throttling risk
- Corsair Nautilus 360 RSExcellent fit
- Corsair Nautilus 240 RS ARGBAcceptable fit
- Arctic Liquid Freezer III Pro 360Excellent fit
Thermalright Peerless Assassin 120 SE on other CPUs
Terms used on this page
- Thermal headroom
- The cooler's sustained dissipation rating minus the CPU's boost power limit, in watts. Positive headroom lets fans run slower and quieter; 25 W or more is rated Excellent here.
- TjMax
- The maximum junction temperature the maker allows, typically 95–100 °C. AMD lists 90 °C for the Ryzen 7 5800X3D, 89 °C for the 7800X3D and 95 °C for the 9800X3D. At TjMax the CPU throttles clocks to stay in place; it will not overheat, but it will lose performance.
- PL1 / PL2
- Intel's two power limits. PL1 (Processor Base Power) is the sustained draw the CPU settles at; PL2 (Maximum Turbo Power) is the short-term boost ceiling. Many desktop boards run PL2 indefinitely, so a cooler must be sized for PL2, not PL1.
- Thermal throttling
- Automatic clock reduction when the CPU hits TjMax. A pairing is flagged as a throttling risk when the modelled full-load temperature reaches the junction limit or the cooler is rated 15 W or more below the CPU's boost power.
- RAM clearance
- The tallest memory module that fits under an air cooler's front fan in its stock position. Dual-tower coolers with less than 42 mm clash with tall RGB kits (typically 44 mm) unless the fan is raised.
- CPU cooler height
- The installed height of an air cooler from the motherboard, compared against the case's published CPU cooler clearance. Coolers at or above 160 mm exclude many compact Micro-ATX and tempered-glass mid-towers.
- Dual-tower air cooler
- An air cooler with two fin stacks and a fan between them (often a second in front). Highest air-cooling capacity, but the front fan overhangs the DIMM slots, which is where RAM clearance limits come from.
Frequently asked questions
Will the Thermalright Peerless Assassin 120 SE keep the Core Ultra 7 265K from thermal throttling?
Yes. The estimated full-load temperature is 96 °C, 4 °C below the 100 °C throttle point.
What temperature should I expect while gaming on the Core Ultra 7 265K with this cooler?
Around 60 °C with a 35 °C case ambient, because GPU-bound games only draw about 135 W from the CPU package. Cooler rooms and better case airflow lower that figure.
Does the Thermalright Peerless Assassin 120 SE fit tall RGB RAM?
Modules up to 42 mm clear the front fan in its stock position. 44 mm kits require raising the fan.
Is the Thermalright Peerless Assassin 120 SE compatible with the LGA1851 socket?
Yes, LGA1851 hardware is included. Supported sockets: AM4, AM5, LGA1200, LGA1700, LGA1851.
Hubs: Core Ultra 7 265K · Thermalright Peerless Assassin 120 SE · LGA1851