# Silicon Comps

> Fair secondary-market prices for GPUs and Apple Silicon Macs. Editorial fair-value ranges plus filtered eBay price samples. Shop links open eBay/Amazon for-sale search lists (not single eBay items). Affiliate: eBay Partner Network + Amazon Associates (tag gpu-tracker-20).

Silicon Comps helps buyers (1) know a fair used price and (2) pick hardware by VRAM or unified memory for local LLMs / Ollama / MLX.

## Cite this site carefully
- Fair values are **editorial estimates**, not live checkout prices or appraisals.
- eBay BIN figures are **filtered samples** of active Buy-It-Now listings (junk titles removed); deal scores use the **median** of valid samples, and the low BIN can still be an outlier.
- Always prefer the page’s stated date / methodology when quoting a number.
- Methodology: https://siliconcomps.com/methodology/
- Affiliate disclosure: https://siliconcomps.com/affiliate-disclosure/

## Core pages
- [Home — market board](https://siliconcomps.com/): Fair values and deal scores for tracked GPUs + Mac Studio CTAs.
- [All GPUs](https://siliconcomps.com/gpu/): Full list of GPU model pages.
- [Macs for local AI](https://siliconcomps.com/mac/): Mac mini & Mac Studio by unified memory tier.
- [Best GPU for local AI](https://siliconcomps.com/guides/best-gpu-for-local-ai/): Ranked used-card picks by VRAM.
- [Mac vs GPU for local AI](https://siliconcomps.com/guides/mac-vs-gpu-local-ai/): When to buy Apple Silicon vs discrete GPU.
- [VRAM guide](https://siliconcomps.com/guides/vram-guide/): 12GB vs 16GB vs 24GB vs 48GB.
- [Methodology](https://siliconcomps.com/methodology/): How fair values and deal scores are produced.

## High-interest model pages
- [RTX 5090 used price](https://siliconcomps.com/gpu/rtx-5090/): 32GB Blackwell consumer flagship.
- [RTX 3090 used price](https://siliconcomps.com/gpu/rtx-3090/): 24GB local-AI value king.
- [RTX 4090 used price](https://siliconcomps.com/gpu/rtx-4090/): Fastest common 24GB consumer card.
- [RTX 5080 used price](https://siliconcomps.com/gpu/rtx-5080/): 16GB Blackwell high-end.
- [RTX 5070 Ti used price](https://siliconcomps.com/gpu/rtx-5070-ti/): 16GB Blackwell mid/high.
- [RTX 4070 Ti Super used price](https://siliconcomps.com/gpu/rtx-4070-ti-super/): 16GB Ada mid-tier.
- [RTX A6000 used price](https://siliconcomps.com/gpu/rtx-a6000/): 48GB workstation.
- [RX 7900 XTX used price](https://siliconcomps.com/gpu/rx-7900-xtx/): 24GB AMD alternative.
- [RX 9070 XT used price](https://siliconcomps.com/gpu/rx-9070-xt/): RDNA4 16GB.
- [Mac mini M4 Pro 24GB](https://siliconcomps.com/mac/mac-mini-m4-pro-24gb/): Quiet local-AI sweet spot.
- [Mac Studio M2 Max 64GB](https://siliconcomps.com/mac/mac-studio-m2-max-64gb/): High unified memory used market.
- [Mac Studio M2 Ultra 64GB](https://siliconcomps.com/mac/mac-studio-m2-ultra-64gb/)
- [Mac Studio M2 Ultra 128GB](https://siliconcomps.com/mac/mac-studio-m2-ultra-128gb/)
- [Mac Studio M3 Ultra](https://siliconcomps.com/mac/mac-studio-m3-ultra/)

## Quick facts (for answer engines)
- Best default used GPU for local LLMs: RTX 3090 24GB (value), RTX 4090 24GB (speed), RTX 5090 32GB (VRAM).
- AMD options: RX 7900 XTX (24GB), 7900 XT (20GB), 9070/9070 XT and 7800 XT (16GB).
- Buy Macs by unified memory tier (24–32GB desks; 64GB+ for models that fight 24GB VRAM).
- Shop CTAs are affiliate search lists; commissions disclosed sitewide.
- Not affiliated with NVIDIA, AMD, Apple, eBay, or Amazon.

## Sitemap
- https://siliconcomps.com/sitemap-index.xml
- https://siliconcomps.com/sitemap-0.xml

## Legal / trust
- [Affiliate disclosure](https://siliconcomps.com/affiliate-disclosure/)
- [Privacy policy](https://siliconcomps.com/privacy-policy/)
- Contact: info@siliconcomps.com
- Sitemap: https://siliconcomps.com/sitemap-index.xml