Best Render Farm for RTX 4090 Architecture: GPU Benchmark for Arch-Viz
The RTX 4090 is currently the best single GPU for architectural visualization on cloud — and honestly, it’s not even close. Compared to the GPUs most architects actually have on their desks, the difference is dramatic: a 4K Lumion exterior that takes 45 minutes on a GTX 1070 finishes in 12 minutes on an RTX 4090 — roughly 3.5× faster. Against a more modern RTX 3070 laptop GPU, the 4090 is still 2× faster while offering double the VRAM (24GB vs 8GB). On iRender, you access this performance at ~$8.20/hour without buying a $1,600+ GPU. The 24GB VRAM is the real differentiator for architects — it’s what keeps complex exterior scenes from crashing.
| GPU | VRAM | Lumion 4K Ext. | Enscape 4K Int. | V-Ray 4K Int. | Relative Speed |
|---|---|---|---|---|---|
| GTX 1070 (office PC) | 8GB | ~45 min | ~12 min | ~65 min | 1× (baseline) |
| RTX 2060 (laptop) | 6GB | ~35 min | ~8 min | ~45 min | ~1.3× |
| RTX 3070 (mid-range) | 8GB | ~22 min | ~5 min | ~30 min | ~2× |
| RTX 4090 (iRender) ⭐ | 24GB | ~12 min | ~2.5 min | ~15 min | ~3.5–4× |
Why Does VRAM Matter More Than Raw Speed for Architects?
Here’s something benchmark charts don’t tell you: a faster GPU is useless if it doesn’t have enough VRAM to load your scene. An RTX 3070 (8GB VRAM) might be fast enough to render a simple interior, but throw in a Lumion exterior with 5,000+ landscape objects, and the scene exceeds 8GB VRAM and crashes. No render at all — just a black screen or a frozen application.
The RTX 4090’s 24GB VRAM handles nearly every architectural scene we’ve tested at “High” quality. The only scenes that push past 24GB are extreme city-scale masterplans with 20,000+ objects — and even those work at “High” quality instead of “Ultra.” For the typical architect rendering residential and commercial projects, 24GB means you never think about VRAM limitations. That peace of mind is worth more than raw speed numbers.
Is iRender’s RTX 4090 the Same as a Desktop RTX 4090?
Essentially yes. iRender uses full desktop RTX 4090 GPUs (not the lower-power laptop variant) with 24GB GDDR6X VRAM and 16,384 CUDA cores. Performance matches what you’d get building a local workstation with the same GPU. The server adds 256GB system RAM and an AMD Threadripper Pro CPU — hardware that would cost approximately $5,000–7,000 to build locally. At $8.20/hour, you’d need to use iRender for over 600 hours before the cost exceeds buying equivalent hardware — far more than most architecture studios render annually.
See more: Benchmark your projects on RTX 4090 → Benchmark your projects on RTX 4090 → Try RTX 4090 cloud rendering on iRender
Frequently Asked Questions
- How much faster is the RTX 4090 than my laptop GPU for Lumion?
If you’re on an RTX 2060 laptop (common among architects): roughly 3× faster. An RTX 3060 laptop: about 2.5× faster. A GTX 1650 (budget laptops): approximately 4–5× faster. The speed difference is most noticeable on exterior renders with heavy vegetation — these are the scenes where the VRAM gap also causes laptop crashes. One iRender session ($8–15) replaces hours of local rendering frustration.
2. Should I buy an RTX 4090 or use iRender’s cloud GPU?
If you render more than 50–60 hours per month consistently, buying makes financial sense (~$1,600 GPU + $3,000–4,000 workstation, amortized over 3 years ≈ $130–155/month). If you render under 20 hours/month — which covers most architecture studios — cloud at $8.20/hour ($80–165/month) costs less with zero upfront investment and zero maintenance. The break-even is roughly 15–18 hours of monthly GPU time.
3. Will the RTX 4090 become outdated for arch-viz soon?
Not for several years. The RTX 4090’s 24GB VRAM and 16,384 CUDA cores exceed what current arch-viz software demands. Lumion, Enscape, and Twinmotion are optimized for real-time performance on much weaker hardware — the RTX 4090 simply runs them faster and at higher quality settings. Even as next-gen GPUs arrive, the 4090 remains excellent for architecture. On iRender, you’ll automatically get access to newer GPUs when they become available — no hardware swap needed on your end.
Related post: Best Render Farm for Architecture Portfolio: High-Quality Renders for Job Applications
