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Custom PC Assembly Service: Building to Your Exact Specifications
Quick answer: A custom PC assembly service is useful when you already own some of the parts but want the rest of the system professionally built around them. For this build, the customer supplied an ASUS ROG Astral RTX 5090, two SSDs and a network card, along with specific instructions for where each M.2 drive should be installed.
Last updated: 27 September 2026
AT A GLANCE
Built for
Customers supplying their own parts
Key Components
Customer-supplied RTX 5090 + Ryzen 9 9950X3D
Case
Phanteks NV7 - White
Price
SGD $6,030
Watch the Build
Who this PC is for
Someone who already owns some of the parts and wants the rest of the system built around them. This customer already had the RTX 5090, two SSDs and a network card. What they needed was the rest of the system supplied and everything assembled according to their own instructions. This type of service makes sense if you have components you already own, or if you have specific preferences for how the build should be configured rather than buying a completely pre-selected PC.
Can I bring my own GPU and SSDs to an assembly service?
Yes. In this build, the customer supplied their own ASUS ROG Astral RTX 5090, a Samsung 990 Pro 4 TB SSD, a Samsung 990 Pro 1 TB SSD and a network card. Mansa supplied the remaining parts and assembled the system around them.
This can make sense when you already own expensive components that you still want to use. Instead of replacing everything, the new build can be planned around the parts you already have. The customer also specified which M.2 slot each SSD should go into, so those placement instructions became part of the assembly rather than being left to guesswork.
Will you follow specific instructions for my build?
Yes, as long as the request is possible with the parts being used. This customer gave specific instructions for which M.2 slot each SSD should be installed in, and the build was assembled according to those notes.
That is important when you already know exactly how you want your system configured. If a requested setup cannot be done because of compatibility or physical limitations, that should be clarified before the build is completed.
What should I tell the builder when I bring my own parts?
Tell the builder exactly which parts are yours and whether you have any specific installation requirements. In this case, the customer did not simply hand over the components, they also specified where each SSD should be installed.
Details like drive placement, additional cards and parts that must be reused should be discussed before assembly starts. That gives the builder a clear plan and also makes it easier to identify any compatibility issue before the PC is put together.
FULL SPECS
Parts List
Motherboard
ASUS X870E ROG Crosshair Hero Wi-Fi 7 & Bluetooth
Processor
Ryzen 9 9950X3D
Cooler
TRYX ARGB Panorama 360 mm - Black AIO
Graphics Card
Customer-supplied ASUS ROG Astral RTX 5090
Storage
Samsung 9100 Pro 1 TB Gen.5 SSD
Storage
Customer-supplied Samsung 990 Pro 4 TB SSD - Secondary
Storage
Customer-supplied Samsung 990 Pro 1 TB SSD - Third
RAM
G.Skill RGB Trident Z5 Neo 64 GB DDR5 6000 MHz
Power Supply
Seasonic Vertex PX 1200 W 80+ Platinum
Case
Phanteks NV7 - White
Operating System
Activated Windows 11 Pro 64-Bit
Fans
9 × Corsair QX120 120 mm RGB Fans
Build Photos
Swipe or use arrows to see more photos.
Full Interior View
A full side view of the completed Phanteks NV7 build, showing the RTX 5090, TRYX Panorama AIO, and nine Corsair RGB fans inside the white chassis.
ROG Astral RTX 5090
A close-up of the customer-supplied ASUS ROG Astral RTX 5090 installed in the system, with the surrounding RGB fans and internal cabling visible.
Trident Z5 Neo Memory
A close-up of the G.Skill Trident Z5 Neo 64GB DDR5 6000MHz memory installed on the ASUS ROG Crosshair X870E Hero motherboard.
TRYX Panorama 360 mm AIO
The TRYX Panorama 360 mm AIO cooler installed over the Ryzen 9 9950X3D, with its display and surrounding RGB lighting visible.
Completed Phanteks NV7 Build
An angled exterior view of the finished white Phanteks NV7 system, highlighting the clean glass-panel design and blue RGB lighting throughout the build.
Price
SGD $6,030
Price as of September 2026. Part prices change. Press the WhatsApp button on the right to check today's price or change a part.
FAQ
Questions Buyers Ask
Can I use parts I already own in a new custom build?
Yes, if the parts are compatible with the new configuration. This build used the customer's RTX 5090, two SSDs and network card while the remaining components were supplied for the new system.
What happens if one of my requested parts or configurations cannot be used?
It should be checked before assembly. If a requested configuration is not possible with the parts being used, we’ll clarify that first. If it can be done, we’ll follow the customer’s instructions as specified.
Want Something Like This?
Every build can be changed: a different graphics card, colour or case. Tell us what you play or work on and we'll suggest the parts.
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