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Custom Gaming PC Singapore with RTX 4090 + Ryzen 7 9800X3D - $3,205 SGD | Mansa Computers
Quick answer:
This custom gaming PC build in Singapore runs a Ryzen 7 9800X3D with a customer-supplied RTX 4090 in an Asus A31 Black case, with 64 GB of DDR5 memory and 4 TB of NVMe storage, priced at $3,205 SGD for the system excluding the GPU, and assembled by Mansa Computers.
Last updated: September 2025
AT A GLANCE
Build Summary
Build Type
4K Gaming PC
Key Components
Ryzen 7 9800X3D + RTX 4090
Case
Asus A31 - Black Tempered Glass
Price
SGD $3,205
Watch the Build
A High-Capacity Custom Gaming PC
This custom gaming PC build in Singapore combines a Ryzen 7 9800X3D with a customer-supplied RTX 4090, 64 GB of DDR5 memory, and 4 TB of storage inside an Asus A31 Black Tempered Glass case. The full system build is priced at $3,205 SGD, excluding the graphics card.
The platform is built around the Asus B650E-F ROG Strix motherboard with Wi-Fi and Bluetooth, paired with AMD’s Ryzen 7 9800X3D and its 3D V-Cache design. Memory is handled by 64 GB of T-Force Delta DDR5 running at 6000 MHz, while cooling comes from the NZXT Kraken Elite 360 RGB AIO with LCD display. Storage is provided by a Samsung 990 Pro 4 TB NVMe Gen 4 SSD, giving the system plenty of space for games, media, and large project files.
The RTX 4090 was supplied by the customer, and Mansa built the rest of the system around it for a clean, high-end gaming setup focused on strong 4K performance and generous storage capacity.
FULL SPECS
What's Inside
Motherboard
Asus B650E-F ROG Strix Gaming Wi-Fi & Bluetooth
Processor
Ryzen 7 9800X3D
Cooler
NZXT Kraken Elite 360 RGB LCD AIO - Black
Graphics Card
Customer's Own RTX 4090
Storage
Samsung 990 Pro 4 TB NVMe Gen 4 SSD
RAM
T-Force Delta RGB DDR5 64 GB 6000 MHz - Black
Power Supply
Thermalright 1200W 80+ Gold
Case
Asus A31 - Black Tempered Glass
Operating System
Activated Windows 11 Home 64-Bit
Fans
4 x Standard Black Fans
Build Photos
Swipe or use arrows to see more photos.
Memory Installation
A close-up of the T-Force DDR5 memory installed on the Asus motherboard during the build process, showing one of the early assembly stages.
Processor Ready for Installation
A closer look at the Ryzen 7 9800X3D before installation, highlighting one of the key components behind this high-end gaming build.
Motherboard Assembly Stage
A detailed view of the Asus motherboard during assembly, showing the platform layout and installation work before the full system is completed.
Case Detail Shot
A close-up of the Asus A31 case, showing its front panel design, top I/O area, and clean exterior finish.
The Full Build
Front view of the completed Asus A31 system, showing the tempered glass side panel and the finished interior built around the customer-supplied RTX 4090.
PERFORMANCE
Performance at 4K
The RTX 4090 at 4K reaches 151 FPS in Resident Evil 4 and 98 FPS in Dragon’s Dogma 2, based on benchmark data from GamersNexus. Starfield runs at 92 FPS, Black Myth: Wukong at 67 FPS, and Cyberpunk 2077 at 64 FPS. These figures come from the RTX 5090 review, where the RTX 4090 appears as a comparison card.
All five figures are rasterization results, and the Ryzen 7 9800X3D’s 96 MB 3D V-Cache helps support strong gaming performance alongside the RTX 4090, especially in CPU-sensitive titles.
“The RTX 4090 handily beats its predecessors, the RTX 3090 and RTX 3090 Ti by a significant margin.”
PCGamesNTotal Price
SGD $3,205
This price covers the full system build excluding the graphics card. The RTX 4090 was supplied by the customer. Pricing as of September 2025. Component prices may change depending on market conditions and parts availability. Press the WhatsApp button on the right if you need help planning a current build quotation.
FAQ
Frequently Asked Questions
How much does a custom gaming PC cost in Singapore?
The cost of a custom gaming PC in Singapore depends on the parts chosen, especially the graphics card, processor, cooling, and case. This build is priced at $3,205 SGD for the full system excluding the customer-supplied RTX 4090.
Can this PC run games at 4K?
Yes. With an RTX 4090, this build is designed for high-end 4K gaming. Reference benchmark data shows very strong 4K results in demanding titles, and the Ryzen 7 9800X3D helps support smooth performance alongside the GPU.
Can I bring my own GPU to Mansa Computers for a custom build?
Yes. This build is an example of that approach. The customer supplied the RTX 4090, and Mansa built the rest of the system around it, including the motherboard, processor, cooler, memory, storage, power supply, case, and operating system.
What is the Ryzen 7 9800X3D and why is it used for gaming?
The Ryzen 7 9800X3D is a gaming-focused AMD processor that uses 3D V-Cache technology to improve gaming performance in many titles. It is a strong fit for premium gaming builds because it pairs well with powerful graphics cards and helps reduce CPU-side limitations in demanding games.
Want Something Like This?
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