retail GPU と GPU 搭載 PC の実勢価格。Amazon（US/JP）、eBay、AliExpress、メルカリ/国内中古（price-rank 集計）、ドスパラ中古から収集し、VRAM 1GB あたりの価格で順位付けしました。murakumo.cloud にセルフホストノードとして GPU を貸す（ストアで貸し手として登録する）場合の調達ガイドも兼ねています。
¥/GB は観測レンジの中央値からの目安です。上位はデータセンター引き抜き品: 安いが手間とリスクが大きい。下に行くほど高く、安全で速くなります。LLM 推論の実用解は 中古 RTX 3090（24GB、CUDA、日本で ¥165k〜）。新品保証付きなら RTX 5060 Ti 16GB（¥111,000） が現実的です。
| # |
製品 |
VRAM |
実勢価格（観測レンジ） |
~¥/GB |
入手先 |
確度 / リスク |
| 1 |
AMD Instinct MI50 32GB (used) |
32 GB |
$120–210 (≈¥19k–33k) |
~¥800 |
AliExpress search
|
snippet / high risk: ROCm support ended, no video output, cooling mod required |
| 2 |
NVIDIA Tesla P100 16GB (used) |
16 GB |
$99–150 (≈¥15k–23k) |
~¥1,100 |
AliExpress search
|
snippet / high risk: passive cooling, pulled from a datacenter |
| 3 |
NVIDIA Tesla P40 24GB (used) |
24 GB |
$239–404 (≈¥37k–63k) |
~¥1,900 |
eBay listing / eBay search
|
confirmed (aggregator fetched) / medium risk: Pascal generation, slow, cooling fan required |
| 4 |
NVIDIA Tesla V100 16GB PCIe (used) |
16 GB |
$270–450 (≈¥42k–70k) |
~¥2,900 |
eBay search
|
confirmed / medium risk: the dirt-cheap SXM2 listings need an adapter and are a different thing |
| 5 |
RTX 3060 12GB (used) |
12 GB |
¥28,000–50,000 (winning-bid average ¥36,395) |
~¥3,000 |
price-rank / Mercari search
|
snippet / low risk: an easy entry tier on current drivers |
| 6 |
RX 7900 XTX 24GB (used) |
24 GB |
¥105,000–128,000 (winning-bid average ¥112,551) |
~¥4,850 |
price-rank / aucfan auction stats
|
snippet (multiple sources agree) / medium risk: no CUDA (ROCm/Vulkan) |
| 7 |
RTX 3090 24GB (used) |
24 GB |
¥165,000–190,000 (JP) / $1,050–1,300 (eBay) |
~¥7,400 |
price-rank (incl. Mercari) / Mercari search / eBay search
|
confirmed / medium risk: mining-hardened units sit at the bottom of the range. The standard for LLM inference: CUDA + 24GB + 936GB/s |
| 8 |
RTX 5060 Ti 16GB (new) |
16 GB |
¥111,000 (Amazon.co.jp 最安) / $549–589 (US) |
~¥6,900 |
kakaku (MSI 16G) / Amazon.co.jp search
|
confirmed (kakaku fetched) / low risk: the cheapest warranted 16GB |
| 9 |
RX 9070 XT 16GB (new) |
16 GB |
$629–699 (≈¥97k–108k) |
~¥6,400 |
Amazon.com search
|
snippet / low risk: best new-gaming price-performance (no CUDA) |
| 10 |
RTX 4090 24GB (used) |
24 GB |
¥360,000–430,000 (JP) / $2,200–2,800 (eBay) |
~¥16,600 |
price-rank / eBay search
|
confirmed (lower bound) / discontinued and still climbing — value is getting worse |
| 11 |
RTX 5090 32GB (new) |
32 GB |
¥690,000–800,000 (JP) / $4,329–4,500 (US) |
~¥21,500 |
Amazon.co.jp search / Amazon.com search
|
confirmed (US) + snippet (JP) / running at about 1.75× the ¥393,800 MSRP |
| 製品 |
VRAM |
価格 |
入手先 |
確度 / リスク |
| RTX 5090 |
32 GB |
$4,329–4,500 / JP ¥690k–800k (MSRP $1,999 / ¥393,800) |
Amazon.com search
|
confirmed (gpudeals 7/24) |
| RTX 5080 |
16 GB |
$1,360 / cheapest new in JP ¥189,000–260,000 |
Amazon.com search / price-rank
|
confirmed |
| RTX 5070 Ti |
16 GB |
$919 (US $900–1,250) / JP ¥148,000–175,000 |
Amazon.com search / kakaku list
|
snippet |
| RTX 5070 |
12 GB |
$549 (≈¥85k) |
Amazon.com search
|
snippet |
| RTX 5060 Ti 16GB |
16 GB |
¥111,000 (Amazon.co.jp) / $589 (US) |
kakaku (MSI)
|
confirmed |
| RTX 4070 Super |
12 GB |
$734 (remaining stock) |
Amazon.com listing
|
snippet |
| RX 9070 XT |
16 GB |
$629–699 (MSRP $599) |
Amazon.com search
|
snippet |
| RX 7900 XTX |
24 GB |
$929 new (below the $999 MSRP) |
Amazon.com search
|
snippet |