RX 9070 XT vs RX 7900 XTX for Local AI

Data freshness: 22 October 2026. Specs from staging products + specifications tables. Benchmarks only from non-quarantined rows. Estimates labeled. Unknowns stay not-yet-measured. Do not invent tok/s.

1. 30-second verdict

This is a same-vendor capacity comparison — both cards are AMD Radeon discrete GPUs on the ROCm/Vulkan stack, and the RX 7900 XTX (RDNA 3, 2022) records 24 GB GDDR6 at 960 GB/s on a 384-bit bus, 6,144 stream processors, PCIe 4.0 x16, 355 W, launch MSRP $999. The RX 9070 XT (RDNA 4, Navi 48, 2025) records 16 GB GDDR6 at 640 GB/s on a 256-bit bus, 4,096 stream processors, PCIe 5.0 x16, 304 W, launch MSRP $599 (vendor spec pages). The 7900 XTX holds a calculated 50% VRAM advantage (24 / 16) and a calculated 50% bandwidth advantage (960 / 640), plus every sourced benchmark row in this pair: Llama-3.1-8B Q4_K_M at 76 tok/s generation / 2,100 tok/s prompt on llama.cpp ROCm (myaihardware.com, 2026-05-22), SDXL Turbo at 40 img/min (Tom's Hardware, 2025-06-01), and Qwen3.8-27B rows at 30.7 and 36.3 tok/s (github.com/sudoingX/qwen38-mtp, 2026-09-17). The 9070 XT has no benchmark row on any stack — there is no same-lab pair, so no speed winner is declared. The 9070 XT is $400 cheaper at launch MSRP and 51 W lower TDP, on the newer RDNA 4 architecture with PCIe 5.0 x16. Street price is not yet measured on either card. If your models fit 16 GB, this is a price-and-efficiency decision on a $400 gap; if you need 20–24 GB-class models, the 7900 XTX is the only one of the two that fits them.

2. Memory architecture

Both cards are discrete VRAM, not unified memory. Addressable GPU memory equals physical VRAM: 24 GB on the 7900 XTX versus 16 GB on the 9070 XT — a calculated 50% capacity advantage for the XTX (24 / 16, from recorded specifications). Both record GDDR6; the bandwidth gap comes from bus width and speed: 960 GB/s on 384-bit (7900 XTX) versus 640 GB/s on 256-bit (9070 XT) — a calculated 50% bandwidth advantage for the XTX (960 / 640). ECC is not recorded for either card. Neither card records NVLink support. Two of either card stay 2×24 GB or 2×16 GB unless a runtime shards; dual-card tok/s is not yet measured here.

3. Model-fit table

Fit labels use ai_models calculated min/recommended configs plus discrete VRAM from the product records. They are capacity checks, not speed claims.

The capacity divide changes the fit lines: 8B and 14B-class models fit both cards, while 20–32 GB-class models fit the 7900 XTX only. The 9070 XT tops out at the 16 GB class; the 7900 XTX reaches into 24 GB-class models (Mistral Small 3.2 24B, Gemma 3 27B, Qwen 3 32B) at their calculated minimums. FLUX.1 dev at its recommended 16 GB FP8 config fits both.

4. Direct benchmark table

Only non-quarantined benchmarks rows. A blank cell means no sourced row for that card — not zero. Estimate means is_estimate=1. Do not treat one-sided rows as a pair.

Every row in this table is one-sided on the 7900 XTX. The RX 9070 XT has no benchmark row on any stack. There is no same-lab pair, so this page does not ratio any 7900 XTX number against the 9070 XT or declare a speed winner. The Llama-3.1-8B and Qwen3.8-27B rows are same-stack-family candidates for future comparison (both ROCm/Vulkan), unlike cross-vendor pairs where CUDA rows can never match, but a direct 9070 XT row simply does not exist yet.

5. Runtime compatibility

Both cards share the same AMD software stack — CUDA does not apply to either. Local-LLM stacks run via ROCm or Vulkan backends (llama.cpp ships both builds). Sourced rows on the 7900 XTX are ROCm (Llama-3.1-8B, Qwen3.8-27B) and ComfyUI (SDXL Turbo); the Qwen3.8-27B spec-off row used Vulkan. The two cards differ on the host bus: PCIe 5.0 x16 on the 9070 XT versus PCIe 4.0 x16 on the 7900 XTX (vendor spec pages). Fine-tune / multi-adapter stacks beyond the sourced rows are not yet measured on this pair.

6. Quantization compatibility

The sourced generation rows use Q4_K_M (Llama-3.1-8B, 7900 XTX), Q4_K_M / UD-Q4_K_M (Qwen3.8-27B) and a spec-off (no-quant) baseline. No quant row exists for the 9070 XT on any stack. Q5/Q6/Q8 decode on this pair is not yet measured. Because both cards are AMD and both use the same llama.cpp backends, quant-level fit differences are driven purely by the 8 GB capacity gap — the 7900 XTX can hold the same models at the same quants plus the 24 GB class the 9070 XT cannot reach.

7. Max practical context examples

Context capacity is a function of VRAM minus weights, and the 8 GB gap shows up here directly. On the 7900 XTX (24 GB), an 8B Q4 model (~5 GB weights) leaves ~19 GB for KV cache — long-context runs (32k+) are practical from the recorded capacity. On the 9070 XT (16 GB), the same model leaves ~11 GB — comfortable for 4–16k context. Sourced context-length rows for this pair are not yet measured; these are capacity-derived bounds, not measured limits. The 7900 XTX also fits 24B-class models that the 9070 XT cannot load at all.

8. Power

The RX 7900 XTX records the higher rated board power: 355 W TDP versus 304 W on the 9070 XT (vendor spec pages) — a 51 W gap. These are rated board powers, not measured inference consumption. Energy cost per million tokens is not yet measured on either card. The 9070 XT's lower rating is one of its two headline trade-offs against the 7900 XTX, alongside price.

9. Current price

The recorded launch MSRPs differ by $400: RX 9070 XT $599, RX 7900 XTX $999 (products.msrp_usd, both price_checked_at 2026-09-02). street_price_usd is NULL on both and no product_offers rows exist for either card. Treat launch MSRP as a price class, not a street quote, and check live listings before buying.

10. Used price

Not yet measured. There are no used-market rows in the database for either the RX 9070 XT or the RX 7900 XTX. Used prices for the 7900 XTX, released in 2022, may sit well below its $999 launch MSRP, but this page does not print an unsourced number — check current listings.

11. Performance per current dollar

Not computable as a pair. Only the 7900 XTX has sourced benchmark rows (76 tok/s Llama-3.1-8B Q4_K_M ROCm at $999 launch MSRP, 40 img/min SDXL Turbo), and the 9070 XT has none. With no 9070 XT speed figure, a tok/s-per-dollar ratio would be a fabricated number. What the recorded data does say: the 7900 XTX delivers 76 tok/s and 2× the capacity class at a $400 premium — whether that premium is worth it depends on whether 24 GB-class models are in your workload. The 9070 XT is not yet measured on any workload, so its per-dollar performance is unknown, not zero.

12. Multi-GPU considerations

Neither card records NVLink support; AMD scaling is software-driven. Two 7900 XTX cards give 48 GB theoretical; two 9070 XT cards give 32 GB theoretical — both not yet measured for tok/s here. For 24 GB-class models that do not fit one 9070 XT, the options are a single 7900 XTX or a dual-9070-XT split if your stack shards (llama.cpp RPC / multi-GPU). Sourced multi-GPU rows for this pair do not exist.

13. System requirements

Both cards are dual-slot-class desktop add-in boards requiring PCIe x16 slots and standard ATX PSUs. The 7900 XTX records PCIe 4.0 x16 and 355 W rated board power; the 9070 XT records PCIe 5.0 x16 (backward compatible with PCIe 4.0 slots) and 304 W. PSU sizing follows total system draw plus the card TDP; exact recommended PSU wattage for either card is not recorded in our database. Neither card records a height/length spec here — check the vendor page or case compatibility before buying.

14. Who should buy the RX 9070 XT

• Anyone whose largest model fits 16 GB (8B and 14B class) and who does not want to pay the $400 launch-price step to the 7900 XTX ($599 vs $999).
• Buyers who want the 51 W lower rated board power (304 W vs 355 W) and the newer RDNA 4 architecture on PCIe 5.0 x16.
• Anyone on an AMD ROCm/Vulkan stack who accepts that no measured speed figure exists for this card yet — the same-stack rows on the 7900 XTX are the closest reference.
• Buyers who do not need 24 GB-class models (Mistral Small 3.2 24B, Gemma 3 27B, Qwen 3 32B do not fit 16 GB at calculated minimums).

15. Who should buy the RX 7900 XTX

• Anyone running 20–24 GB-class models — Mistral Small 3.2 24B, Gemma 3 27B, Qwen 3 32B all fit at their calculated Q4_K_M minimums on 24 GB.
• Buyers who want the calculated 50% memory-bandwidth advantage (960 vs 640 GB/s) and the only sourced benchmark rows in this pair: 76 tok/s Llama-3.1-8B Q4_K_M on ROCm, 40 img/min SDXL Turbo, and the Qwen3.8-27B rows.
• Anyone on an AMD ROCm/Vulkan stack who wants measured throughput rather than an unmeasured newer card.
• Buyers who accept the $400 higher launch MSRP and 355 W rated power in exchange for the 24 GB capacity class and 6,144 stream processors.

16. Evidence / source table

• RX 9070 XT product page · RX 7900 XTX product page
• RX 9070 XT current listing (affiliate)
• RX 7900 XTX current listing (affiliate)

17. Data freshness date

Specs and benchmark rows as stored in the staging database on 22 October 2026 (price_checked_at 2026-09-02, benchmark tested_at dates 2025-05-22 through 2026-09-17). Product offers are empty; treat prices as launch-MSRP classes and verify live.

Frequently asked questions

Is the RX 9070 XT better than the RX 7900 XTX for AI?

Only if 16 GB covers your models and you value the $400 lower price and 51 W lower TDP over capacity. The 7900 XTX has 50% more VRAM (24 vs 16 GB), 50% more bandwidth (960 vs 640 GB/s), and every sourced benchmark row in this pair.

Which GPU is faster for local LLM inference?

Only the 7900 XTX is measured: 76 tok/s Llama-3.1-8B Q4_K_M on ROCm, 30.7 and 36.3 tok/s Qwen3.8-27B. The 9070 XT has no benchmark row on any stack — no speed winner can be declared.

What do these cards cost?

$599 (9070 XT) vs $999 (7900 XTX) launch MSRP. Street price is not yet measured on either; no product_offers rows exist.

Which GPU uses more power?

The 7900 XTX: 355 W vs 304 W rated TDP — a 51 W gap. Rated board power, not measured inference consumption.

Do these cards use the same software stack?

Yes — both are AMD, so both run ROCm/Vulkan stacks; CUDA does not apply to either. A future 9070 XT ROCm row would be directly comparable to the 7900 XTX rows here.

Should I upgrade from RX 7900 XTX to RX 9070 XT?

You trade 8 GB VRAM, 320 GB/s bandwidth, and all measured throughput for $400, 51 W, RDNA 4, and PCIe 5.0. If your models fit 16 GB, it is a reasonable cost/efficiency move; if you run 24 GB-class models, it is not an option — they do not fit.