Description
Dual RTX 3090 AI Workstation for Local LLMs, Machine Learning & AI Development
Our Dual RTX 3090 AI Workstation delivers an exceptional combination of GPU performance, 48GB of total VRAM, and professional-grade reliability for AI developers, machine learning engineers, researchers, and businesses running AI workloads locally.
Featuring 2× NVIDIA GeForce RTX 3090 24GB GPUs, this workstation provides 48GB of total GPU memory and massive CUDA performance for local LLM inference, AI development, RAG applications, image generation, 3D rendering, video production, and other GPU-intensive workloads. You do not need NVLink to pool VRAM. This system can run 70b models with 4bit quantization out of the box!
Unlike cloud-based AI services that charge ongoing usage fees, a Dual RTX 3090 workstation gives you dedicated local computing power that you control. Run your AI models on-premises, keep sensitive data local, and avoid recurring cloud GPU costs.
This system is an excellent choice for anyone looking for an affordable AI workstation with 48GB VRAM without spending the price of a new professional workstation GPU.
Key Specifications
- CPU: AMD Ryzen 9 5900x 12 core 24 thread
- GPU: 2× NVIDIA GeForce RTX 3090 24GB (Founders Edition, EVGA, MSI, Gigabyte)
- Total VRAM: 48GB
- System Memory: 32GB DDR4 3200 Mhz
- Maximum RAM: Upgradable to 128GB
- Motherboard: Gigabyte/ASUS/MSI X570 DDR4 WiFi/Bluetooth
- PCIe Configuration: x16/x4 standard configuration
- Optional PCIe Configuration: Upgrade to x8/x8 PCIe Gen 4 for an additional $300
- Storage: Western Digital/Samsung/Crucial 1TB PCIe Gen 4 NVMe SSD
- Case: Antec C8 Black with 10 high-airflow PWM fans
- CPU Cooling: 360mm AIO liquid cooler
- Power Supply: 1300W Cybernetics Platinum PSU with 10-year manufacturer warranty (Superflower, Lian Li, Corsair)
- Operating System: Windows 11 Pro or Ubuntu 24.04 LTS (We can install ANY operating system)
- Warranty: 2-year system warranty plus applicable manufacturer warranties
- GPU Warranty: 3-year Custom Lux PCs warranty
48GB of VRAM for Local AI & LLMs
The biggest advantage of this Dual RTX 3090 AI workstation is its 48GB of combined GPU VRAM.
With two RTX 3090 graphics cards, you have the GPU memory and CUDA performance needed for a wide range of AI and machine learning applications, including:
- Local LLM inference
- Large language model development
- RAG (Retrieval-Augmented Generation) applications
- AI agents and local assistants
- Machine learning development
- PyTorch
- TensorFlow
- CUDA applications
- Computer vision
- Multimodal AI
- Image generation
- Video generation
- AI upscaling
- 3D rendering
- Scientific computing
- Data science
- Model experimentation and development
Depending on the model, quantization method, context size, and software configuration, the system can run a wide range of popular open-source AI models, including models from the Llama, Qwen, Mistral, Mixtral, Phi, and Gemma families.
Note: Two GPUs do not automatically combine their VRAM into a single 48GB memory pool in every application. Software must support multi-GPU execution, model sharding, or other memory-management techniques to take advantage of both GPUs.
Dual RTX 3090 for Local LLM Inference
If you’re building a private AI server or local AI workstation, a Dual RTX 3090 configuration offers an excellent price-to-performance ratio.
The 24GB of VRAM on each RTX 3090 provides significantly more memory than many newer consumer GPUs in this price range, making this system particularly attractive for AI developers who prioritize VRAM capacity.
Use your workstation to:
- Run local LLMs with Ollama
- Build AI applications with Python
- Deploy Open WebUI
- Create private RAG systems
- Develop AI agents
- Experiment with quantized models
- Run multimodal AI models
- Perform GPU-accelerated machine learning
- Generate AI images and video
- Fine-tune supported models
- Develop and test AI applications before deploying them to production
Whether you’re an AI developer, business owner, researcher, student, or enthusiast, this 48GB VRAM AI workstation gives you the flexibility to experiment with powerful AI models locally.
Professionally Tested & Stress-Tested (Results Provided to Each Customer Upon Request)
Every Dual RTX 3090 workstation from Custom Lux PCs is thoroughly tested before shipping.
We provide benchmark results and maximum temperatures from testing, including:
OctaneBench
Dual-GPU performance and sustained workload testing.
FurMark
GPU stability and thermal testing.
Cinebench or S-TUI
Two-hour CPU stress testing on Windows or Linux.
MemTest86
Comprehensive system memory stability testing.
CrystalDiskMark
SSD performance and storage testing.
Our RTX 3090 graphics cards are certified refurbished, repadded, and repasted before installation. All other components are new and sealed before installation.
Each GPU is tested under sustained workloads, with maximum temperatures typically reaching approximately 70–73°C under full load, depending on ambient temperature and workload.
The result is a workstation built for demanding AI inference, machine learning, rendering, and long-duration GPU workloads.
Ready for Local AI Development
Your Dual RTX 3090 AI PC arrives ready for your AI workflow.
Included:
- Windows 11 Pro or Ubuntu 24.04 LTS
- NVIDIA GPU drivers
- CUDA environment configuration
- Full system stress testing
- GPU benchmark testing
- CPU stress testing
- RAM stability testing
- SSD performance testing
- Plug-and-play setup
- Free shipping within the continental United States
- Free lifetime technical support
- 2-year Custom Lux PCs system warranty
- Manufacturer warranties on eligible components
Need NVLink?
If your application benefits from NVIDIA NVLink, we can configure a compatible Dual RTX 3090 workstation with NVLink support.
Contact Custom Lux PCs for a customized NVLink configuration and pricing.
Call or text: 732-284-6803
Why Buy Your Dual RTX 3090 AI Workstation from Custom Lux PCs?
At Custom Lux PCs, we specialize in building high-performance computers for AI, machine learning, local LLMs, professional workloads, and demanding applications.
Real Expert Support
No endless support tickets or outsourced call centers. Get direct access to a real technical expert based in the United States by phone, text, or email.
Competitive Pricing
We focus on delivering high-performance systems with carefully selected components at competitive prices.
Personalized Configuration
Every customer can work directly with us to customize their workstation around their specific AI, business, or professional requirements.
Fast Build Times
Most systems are built and shipped in approximately one week or less, depending on component availability and customization.
Extensive Component Selection
From consumer GPUs like the RTX 3090 and RTX 5090 to professional NVIDIA RTX Pro GPUs and AMD Threadripper platforms, we can configure a workstation around your specific workload.
Build Your Dual RTX 3090 AI Workstation Today
If you need an affordable, powerful Dual RTX 3090 AI workstation with 48GB of VRAM, Custom Lux PCs can build a system designed around your AI and machine learning requirements.
Run local LLMs. Build private AI applications. Develop RAG systems. Experiment with machine learning. Create AI-generated images and video. Render complex 3D projects.
Get the performance of a powerful multi-GPU workstation without the recurring cost of renting cloud GPUs.
Ready to get started? Contact Custom Lux PCs today for your custom Dual RTX 3090 workstation.
Call or text: 732-284-6803
Custom Lux PCs – High-Performance AI Workstations Built for Your Workload.
Need more power? Check out our other AI workstations here
Matt Kolano –
Absolutely 10/10 experience. I searched a bunch of the traditional big box custom PC websites and was never quite satisfied with the options. So happy I happened to stumble across this custom lux pcs. The instant service, customization, and pricing was beyond expectations. Am sending all my friends here if they ever need a new rig. Thanks for everything, loving my new PC!!
Brian –
Pat worked with me to choose the right hardware for my PC and helped me sort out a few things as I was getting set up. I’m really happy with the build and impressed with the personalized support along the way. I highly recommend.
Matt Schaffer –
This was a big impulse buy for me for local AI and I have no regrets, my system is amazing. Well put together and no issues. I’ll admit I was a little concerned about having PC shipped. When I received it was so well packaged very efficiently with no damage. Also customer support is top tier. Thank Customer Lux team
Mike G –
I had an outstanding experience with Custom Lux PCs. From the very beginning, the level of service and communication was exceptional. I never felt like I was just placing an order — I felt supported every step of the way.
Pat was fantastic to work with throughout the entire process. He took the time to answer questions, explain options, and make sure the system I was getting would truly meet my needs. That kind of personal attention is rare these days, especially when you’re investing in a high-performance custom machine.
When the system arrived, everything was exactly as promised. The build quality is excellent, the machine runs beautifully, and it’s clear a lot of care and expertise went into putting it together.
If you’re considering a custom PC and want a company that stands behind their work and treats customers the right way, I highly recommend Custom Lux PCs. Pat and the team delivered absolutely outstanding service, and I will definitely be buying from them again in the future.
William Westbrook –
This is actually a 5 start review, like *perfect* service. Like 2-3 minute response time over text to the guy from the guy that runs the place. Personally kept me up to date on a shipping delay on UPS’s side, looked at my picture of the last couple things I had to do before first post.
Marko Rodriguez –
Custom Lux PCs is solid. I provided a specification for what I needed. They came back with “we can do that” and offered some ranges as they knew what was best for my use case and I ended up on this workstation. Googling around, they were right. I went with their proposed tweaks to the design. 2 weeks later — a beautiful machine that “just worked”, no hassle. The team is responsive and straightforward.
Alex Martinez –
I’ve been working with Custom Lux PCs for the last 3 years and I can speak very highly of Patrick and their attention to customer satisfaction. I would highly recommend anyone looking for a custom PC to go with Custom Lux PCs.
Recently I broke the glass on my desktop case and Patrick immediately coordinate a replacement and it was a smooth process and this was all done “at cost”.
David Merrick –
Stumbled across a dual 3090 machine offered by Lux and was SO happy with every part of the sale. The owner personally reached out and helped me through the process, and the machine arrived with everything down to the BIOS configured for my AI workloads. Just needed to pop the GPUs in. Hope to buy another again soon.
D M –
Excellent product, even better support. The PC is extremely well built and the customer service is as good as it get. Patrick even helped me solve setup issues that were cause by my own shifting priorities after the PC was delivered. Very responsive and highly recommend Custom Lux PCs to anyone who is in the market for high-end builds.
Collin S –
I had an exceptional experience working with Pat at Custom Lux PCs. He built a high-performance workstation perfectly tailored for my local AI model development. His pricing is competitive, and his commitment to service—including personal delivery—is outstanding. Having a local professional available for ongoing support and future upgrades provides incredible peace of mind. I highly recommend his services.