PrimoChill 280mm EximoSX Slim Radiator


SKU: R-EXI28-SWN/AAvailability : In stock - In Boise, ID USAIn StockOut of stock

The much anticipated EximoSX are here! These radiators are designed for great performance in a variety of system conditions. The Eximo sports a thin 30mm profile that makes it compatible with... Read more


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Select SX Style*: Sky White

  • Sky White
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The much anticipated EximoSX are here! These radiators are designed for great performance in a variety of system conditions. The Eximo sports a thin 30mm profile that makes it compatible with smaller enclosures and keeps a clean appearance. The internal core has seven dual pass coolant lanes for unparalleled system flow and optimal cooling. Combine this with separate intake and outlet tanks, this radiator has little flow resistance. The fins and tubes are layed out to optimize lower RPM fans while maintaining elite performance.

We next introduced the SX family of colors for unprecedented watercooling color matching in the PrimoChill product family. Match your rad with your fittings, your reservoir, your pump, and your cpu block for stunning visual results. This powder coating process is applied individually to each radiator ensuring a durable finish.

  • High density tube/fin ratio for extreme heat dissipation
  • Optimized fin/tube layout for low RPM fans
  • Efficient system impact with low overall loop slowdowns (High Coolant Flow)
  • 7x Dual pass coolant lanes, for unparalleled system flow
  • Separate intake /outlet tanks for uninterrupted flow
  • Dualtone SpectraX color options available
  • Individually applied, durable powder coated finish
  • 30mm Thickness for simple system compatibility
  • PrimoChill Logo Badge can be applied in any orientation to match system
  • SX family of colors for unprecedented watercooling color matching in PrimoChill product family. Match your rad with your fittings, your reservoir, your pump, and your cpu block.
  • Fitting Ports:2
  • Fitting Thread:G 1/4
  • Fan Mount Spacing: 15mm
  • Fan Mount Thread: M3
  • Materials:Brass / Copper
  • Certifications:ROHS
  • Pressure:1.5 bar
  • Overall Dimensions: 315x140x30mm
  • Heat Transfer Tubes: 14
  • FPI: 20
  • Warranty: 1 year
  • Fittings: G1/4 thread
  • Fan: 140mm x 2
Parts Included
  • 1x EximoSX Slim 280mm Radiator
  • 8x Screws Long (30mm)
  • 4x Screws Short (5mm)
  • 2 Logo Emblems

Mounting hardware is included with your Eximo radiator. Using other mounting hardware may cause damage resulting in leaks voiding your warranty. Always double check the screw length before installation or you risk puncturing the radiator fluid channels.

SX finishes especially Candy and UV Colors can vary in tone based on surfaces and material. For example, knurled surfaces may appear darker than smooth surfaces.

Not responsible for any damage caused by or when using this product. Please use at your own risk.

Logo Installation

Customer Reviews

Based on 4 reviews
Victor P.
Great radiators as always

Just bought my second set of radiators from Primo and gotta say, it’s just amazing. No need to even flush’em 😂

Daniel B.
Great rad with good flow and keeps my computer cool

I have it paired with a 360 mm rad, in the hopes that I can get a 3080 card (jokes on me right?!) and have it included in the loop. Great flow! Perfect pair up with my Lian Li unifans

darren g.
Just a great product

I have been so happy with my SX 240 in my system that when I built my wife's PC I went a ahead and got here the 240 in white . After almost 3 years of use in my PC with no issues getting one for her was a must . They provide excellent cooling . Better than my EK 240 that I had

Davey O.
Awesome products. Good prices

Extremely easy to navigate website.

Shipping Carriers

For all domestic and international orders, we rely exclusively on FedEx and USPS as our carriers. Please note that the choice of carrier for flat-rate shipments is not exclusive to either FedEx or USPS. The selection of carrier for your shipment is determined based on the most cost-effective method. APO/PO Boxes are shipped exclusively with USPS.

Transit Times

The transit times displayed during checkout are estimated by the carrier based on the service type and distance and should not be considered a guarantee.

Effective May 2020, FedEx has suspended all transit guarantees and any form of money back for “delivered service failures” (instances where deliveries are not made on time).

Same Day Shipping

We take great pride in our ability to ship out every in-stock order on the same day, as long as it is placed before 2:00pm MST. For orders placed after this time, they will be shipped out on the following business day.

Please be aware that there are some exceptions to this policy, specifically for our SX colored products. These particular colors are custom powder-coated upon order and may necessitate an additional 1-2 business days for the coating process, as well as inspection and packing. We sincerely appreciate your understanding and cooperation in this matter.

Damaged Items

In the event that you receive a damaged package, please ensure to notify us within 48 hours of receipt by contacting our support portal at or email Please refrain from returning the damaged merchandise, as doing so will void any base carrier insurance and prevent us from issuing any credit. It is necessary to retain the damaged package along with its original packaging for a period of five days to facilitate carrier inspection. Kindly keep all packaging and packing materials available for this inspection process.

Shipment Refusal

In the event that a shipped order is refused or returned undelivered, please be aware that there will be certain fees and charges applied to a refund of your order. These include a mandatory 10% restocking fee, a $20.00 Return Service Fee, and the forfeiture of any outbound shipping charges. If the shipment was originally sent with “Free Shipping,” the actual cost of the outbound shipping will be deducted from your refund.

International Policy

Please note that for all international orders, import duties and taxes are applicable and are the responsibility of the recipient. Failure to pay these duties/taxes will result in your package being returned to sender and your order will be subject to the conditions outlined in our “Shipment Refusal Policy.”

Rush Fee

We offer a convenient option called the “Rush Fee” that allows you to bypass the regular order processing queue. By including the “rush fee” with your order, we will promptly prioritize it, ensuring that it is moved to the front of the line for processing. Once received, your order will be automatically printed and will be the very next one to be picked and processed.

It is important to note that selecting the “Rush Fee” option for your order does not guarantee same-day shipping. However, your chances of shipping same day are significantly increased, especially if your order is placed before 2:00pm (MST).

The purpose of the “Rush Fee” is to speed up the processing of your order. It is essential to understand that this fee does not impact the transit time of your order, as that is determined by the shipping service you choose at the time of checkout.

Rush Fees are non-refundable. Once we receive your order, we immediately kick things into high gear and start providing the service, making a refund unnecessary.

Navidium Shipping Protection

We offer the option to add “Shipment Protection” to your order for an extra fee, which serves as insurance for your package. With Navidium’s Shipment Protection, your package is fully covered in the event of damage, theft, or loss during transit. The cost of shipping protection is determined based on the total value of your order prior to adding shipping costs.

To submit a shipping protection claim, please reach out to PrimoChill through our customer support portal at or email The process is straightforward and hassle-free. We will provide you with a saved cart containing the exact items you purchased, and you will need to complete the checkout process to ensure that your shipping information is accurate. The value of the cart will be adjusted to zero, so there will be no charge since you have already selected shipment protection.


Once an order is placed on our e-commerce website, it cannot be canceled/changed or held. This is because our fully automated systems immediately start processing the order, which cannot be stopped or reversed. Therefore, we advise customers to double-check their orders before making a purchase.

Additionally, we would like to emphasize that our e-commerce website ships 98.5% of orders on the same day they are placed by 2:00 pm MST. Allowing cancellations after an order is placed would significantly slow down our shipping process and potentially affect the delivery times for other customers.

We understand that it can be frustrating to be unable to cancel an order, but we ask for your understanding in this matter. By adhering to our cancellation policy, we can ensure that our automated systems and shipping processes continue running smoothly, allowing us to provide fast and efficient service to all our customers.

We understand that sometimes mistakes can happen, and customers may accidentally order the wrong item or change their minds about a purchase. In such cases, we suggest that customers consider our return policy instead.


Our Product Return Policy allows you to initiate a return within 30 days of purchasing a product from The customer is required to cover the costs associated with returning the product. To be eligible for a return, the product must be in its original new packaging and include all accessories and manuals. Because of the substantial discount they receive, B-Stock, clearance, and used/open box products or gift cards cannot be returned.


Kindly be advised that a restocking fee of 15% will be applicable to returned products. However, if sealed boxes or bags have been lost, discarded, scratched, or opened, a higher restocking fee up to 50% will be charged. Furthermore, products that have been mounted, installed, or had any fluid pass through them will incur a restocking fee of 75%. In the event that your order was shipped using the “free shipping” option, the refund issued to you will be reduced by the equivalent amount of the outbound shipping cost.


The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

Return Inspection

PrimoChill has the right to reject refund requests for any reason in compliance with applicable laws. This policy applies to incomplete items or accessories, as well as hardware, parts, or packaging that have suffered damage. It also covers items misused or used in a way that violates the manufacturer’s recommendations and those damaged or lost during the return process. It is important to securely package the return and ensure it is protected by insurance in case of loss or damage. If the value of the product(s) has decreased due to these circumstances, PrimoChill may deduct reasonable expenses from the refund amount. Consequently, customers returning such items may be subject to a higher restocking fee in addition to the base fee.

If the returned product(s) fail to meet the required returns policy conditions, the customer will be responsible for the expense of having it returned to them. Our support team will contact you to inform you about these issues and provide you with the return cost. Please be aware that the product will only be held for 30 days before it is considered abandoned and disposed of.

Start Your Return

If you would like to initiate a return, please reach out to us at Once your return request is approved, you will receive an email with instructions on how and where to send your package. Please note that we cannot accept items that are returned without prior authorization.

Return Status

Upon inspection and approval of your return, you can expect an automatic refund to be issued within 10 business days. Please note that the refund amount may be reduced by restock fees and associated fees, such as shipping costs. It is important to keep in mind that additional time may be required for your bank or credit card company to process and post the refund. If it has been more than 15 business days since your return was approved, please feel free to reach out to us at

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PrimoChill 280mm EximoSX Slim Radiator