--- title: "Cloud GPU Guides: VRAM Sizing, Costs, Walkthroughs | PowerGPU" description: "Practical cloud GPU guides with live prices: LLM VRAM requirements, H100 vs H200 vs B200, QLoRA fine-tuning, vLLM serving, Stable Diffusion costs, Blender rendering." url: https://powergpu.ai/guides last_modified: 2026-09-14T11:04:20+00:00 prices_as_of: 2026-09-14 site: PowerGPU (powergpu.ai) --- Guides · 16 articles · numbers included # Cloud GPU guides where the prices are never stale Every figure in these articles is rendered live from our price sheet — the same data the console bills from. Written by the team that runs the fleet, updated with every weekly market re-check. [Start here · Choosing hardware LLM VRAM requirements: how much GPU memory for 7B–405B models Complete sizing tables for running and training LLMs — FP16, INT8 and 4-bit, with KV-cache math and the cheapest GPU that fits each model. 12 min read · updated 2026-09-03 Read the guide](https://powergpu.ai/guides/llm-vram-requirements) ## All guides (16) Costs, hardware choices and hands-on walkthroughs — every number on these pages is today's sheet. [Costs & pricing **Cloud GPU pricing explained (2026): on-demand vs spot vs reserved** What actually drives cloud GPU prices in 2026, how marketplaces and hyperscalers differ, and when each billing mode saves you money. 9 min read updated 2026-09-03](https://powergpu.ai/guides/cloud-gpu-pricing-explained) [Choosing hardware **LLM VRAM requirements: how much GPU memory for 7B–405B models** Complete sizing tables for running and training LLMs — FP16, INT8 and 4-bit, with KV-cache math and the cheapest GPU that fits each model. 12 min read updated 2026-09-03](https://powergpu.ai/guides/llm-vram-requirements) [Choosing hardware **H100 vs H200 vs B200 (2026): specs, price per hour, which to rent** Memory, bandwidth and real rental economics of NVIDIA's three datacenter flagships — and when the older card is the better deal. 10 min read updated 2026-09-03](https://powergpu.ai/guides/h100-vs-h200-vs-b200) [Choosing hardware **RTX 5090 vs RTX 4090 for AI (2026): benchmarks, VRAM, rental cost** Specs, VRAM, real throughput differences and cost per run for inference, fine-tuning and image generation on both consumer flagships. 8 min read updated 2026-09-03](https://powergpu.ai/guides/rtx-4090-vs-rtx-5090) [Hands-on walkthrough **How to fine-tune Llama 3.1 8B with QLoRA on a single GPU** A complete, copy-pasteable walkthrough: dataset to merged weights in about an hour on a single 24 GB card, with axolotl. 14 min read updated 2026-09-03](https://powergpu.ai/guides/fine-tune-llm-qlora) [Hands-on walkthrough **How to deploy vLLM on a cloud GPU: an OpenAI-compatible endpoint** Deploy vLLM on a rented GPU, pick the right card for your model size, benchmark tokens per second and put a price on every million tokens. 11 min read updated 2026-09-03](https://powergpu.ai/guides/serve-llm-vllm) [Costs & pricing **Cheapest cloud GPU for Stable Diffusion & Flux in 2026 ($/image)** What SDXL and Flux actually need, images-per-dollar on eight rentable GPUs, and where paying more per hour costs less per image. 9 min read updated 2026-09-03](https://powergpu.ai/guides/cheapest-gpu-for-stable-diffusion) [Hands-on walkthrough **Blender cloud rendering on GPUs: setup, cost per frame, pitfalls** Render Cycles scenes on rented RTX hardware: headless setup, per-frame cost math, and the mistakes that quietly triple a render bill. 10 min read updated 2026-09-03](https://powergpu.ai/guides/blender-cloud-rendering) [Costs & pricing **How much does it cost to rent an H100? Per-hour math for 2026** H100 SXM, PCIe and NVL rental prices per hour and per month, what marketplaces and hyperscalers charge, the rent-vs-buy break-even, and five ways to pay less. 9 min read updated 2026-09-03](https://powergpu.ai/guides/h100-rental-cost-per-hour) [Choosing hardware **Best cloud GPU for LLM inference in 2026, by model size** From 8B to 405B: the cheapest rentable card that holds each model, indicative tokens per second with vLLM, and the cost per million tokens on today's sheet. 10 min read updated 2026-09-03](https://powergpu.ai/guides/best-cloud-gpu-for-llm-inference) [Hands-on walkthrough **How to run ComfyUI on a cloud GPU: setup, models, cost per image** Deploy ComfyUI on a rented RTX 4090 or 5090 in 30 seconds, keep checkpoints on a volume, run workflows headless through the API, and know what each image costs. 9 min read updated 2026-09-03](https://powergpu.ai/guides/run-comfyui-on-a-cloud-gpu) [Hands-on walkthrough **How to rent a GPU with crypto and no KYC (2026)** Renting cloud GPUs with USDT, Bitcoin or Monero and no identity check: how top-ups work, which coin to use, what data is kept, and the step-by-step deploy. 7 min read updated 2026-09-03](https://powergpu.ai/guides/rent-gpu-with-crypto-no-kyc) [Choosing hardware **A100 vs H100 for fine-tuning (2026): cost per run, not per hour** Same 80 GB, 2.7× the hourly price: when an H100 finishes a LoRA, QLoRA or full fine-tune fast enough to beat the A100 on total cost — live prices, break-even rule. 8 min read updated 2026-09-03](https://powergpu.ai/guides/a100-vs-h100-for-fine-tuning) [Costs & pricing **Cheapest cloud GPU for Ollama (2026): 8B to 70B models, by the hour** Which rented card runs each Ollama model size at Q4, indicative tokens per second per card, and what an always-on private assistant costs per month. 8 min read updated 2026-09-03](https://powergpu.ai/guides/cheapest-gpu-for-ollama) [Choosing hardware **Wan 2.x video generation: which GPU, minutes per clip, cost per clip** VRAM needs for Wan 2.1 and 2.2 (1.3B, 5B, 14B), realistic minutes per five-second clip on RTX 4090, 5090, L40S, H100 and H200, and the price of a batch night. 9 min read updated 2026-09-03](https://powergpu.ai/guides/wan-video-generation-gpu) [Costs & pricing **Best GPU for Whisper transcription (2026): speed and cost per audio hour** faster-whisper large-v3 throughput on T4, L4, RTX 3060, RTX 4090 and H100 — and the only number that matters: cents per hour of audio transcribed. 7 min read updated 2026-09-03](https://powergpu.ai/guides/best-gpu-for-whisper) ## Looking for reference material instead? The [documentation](https://powergpu.ai/docs) covers the platform itself; the [use-case playbooks](https://powergpu.ai/use-cases) pre-match GPUs to workloads; the [API reference](https://powergpu.ai/api) has curl you can run before signing up. --- *About PowerGPU:* PowerGPU (powergpu.ai) is a cloud GPU rental service offering 80 NVIDIA GPU models — from the RTX A2000 at $0.024/hr to the B300 — at fixed prices set at least 30% below the public GPU marketplace median and re-checked weekly (H100 SXM: $1.428/hr on-demand). Billing is per second with no minimums; payment is crypto only (USDT, BTC, XMR, ETH, SOL, LTC, TRX) with no KYC. Instances run in Tier-III datacenters across 32 regions with a 99.9% uptime SLA and deploy in about 30 seconds from the web console (cloud.powergpu.ai) or the REST API. Source: https://powergpu.ai/guides · Site index for AI assistants: https://powergpu.ai/llms.txt · Full content: https://powergpu.ai/llms-full.txt