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RTX 4070 vs RTX 3080 — new Ada on Newegg or a vetted Ampere pickup under $350?

RTX 4070 vs RTX 3080 — new Ada on Newegg or a vetted Ampere pickup under $350?

You probably landed here from r/buildapc, a r/buildapcsales GPU alert, or a YouTube « 4070 vs 3080 » chart before opening Amazon, Newegg, or eBay sold listings. This is not 3080 vs 3070 (two used Ampere cards) and not 4070 vs 4060 (Ada mid-tier only): you are choosing between new Ada (RTX 4070, 12 GB, ~200 W, DLSS 3) and used Ampere (RTX 3080, 10 GB, ~320 W, DLSS 2 max). Quick take (July 2026, before sales tax): in plain raster, the 4070 leads roughly 5–12 % (Cyberpunk 1080p ~112 vs ~105 FPS, 1440p ~84 vs ~78 FPS — see GpuComparison). Street bands: new 4070 $425–$475 · used 3080 $325–$425. Buy the 4070 new for warranty, efficiency, and Frame Generation. Buy the 3080 only under $375, stress-tested (FurMark, no VRAM artifacts), with a 650–750 W PSU already in the case.

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Side-by-side specifications

SpecificationRTX 4070RTX 3080
VRAM12 GB10 GB
TDP (reference)~200 W~320 W
ArchitectureAda Lovelace (AD104)Ampere (GA102)
Release year20232020
Typical price (2026)380–440 €300–400 € (occasion)

Indicative benchmarks (avg FPS, raster)

Rounded in-game averages (no DLSS Frame Generation). Useful to compare 1080p vs 1440p feel.

FPS (higher is better)

Cyberpunk 2077

1080p

RTX 4070112 FPS
RTX 3080105 FPS

1440p

RTX 407084 FPS
RTX 308078 FPS

Fortnite

1080p

RTX 4070208 FPS
RTX 3080198 FPS

1440p

RTX 4070142 FPS
RTX 3080132 FPS

Hogwarts Legacy

1080p

RTX 407096 FPS
RTX 308088 FPS

1440p

RTX 407076 FPS
RTX 308068 FPS

Call of Duty (Warzone)

1080p

RTX 4070178 FPS
RTX 3080168 FPS

1440p

RTX 4070138 FPS
RTX 3080128 FPS

Red Dead Redemption 2

1080p

RTX 4070118 FPS
RTX 3080108 FPS

1440p

RTX 4070100 FPS
RTX 308092 FPS

Which GPU for your use case?

  • Casual / single-playerBoth GPUs stay very playable at 1080p. The RTX 4070 has more headroom in recent AAA titles and draws far less power than the RTX 3080.
  • 1080p competitive (high FPS)For competitive gaming both reach high FPS. The RTX 4070 is slightly ahead with better power efficiency.
  • 1440p / light creationAt 1440p the gap favours the RTX 4070 (12 GB VRAM). The RTX 3080 still makes sense on medium–high with DLSS 2.

Bottom line

Pick the RTX 4070 for a new purchase: DLSS 3, warranty, 12 GB VRAM, lower power draw.

Choose the RTX 3080 for a strong used deal (~€300–400) with a 650–750 W PSU — great raster, no DLSS 3.

RTX 4070 build →RTX 3080 build →

FPS varies with CPU, drivers, and scene. Use the PC4Games comparator for picks tied to your games.

PC4Games verdict: new Ada by default, used Ampere only when the eBay math works

RTX 4070 (new) = default 2026 pick: warranty, DLSS 3, 12 GB, ~200 W (quieter, cooler), NVENC gen 9. Best if you are building fresh or want 1440p high without retuning sliders every patch.

RTX 3080 (used) = good deal only under $375, clean card (no artifacts, stable temps), seller with trade history on eBay, r/hardwareswap, or local Marketplace. Above ~$400, a used 3080 loses to a 4070 on sale or a recent 4070 Super open-box.

The raster gap is modest — but daily comfort (heat, noise, DLSS 3) often favors the 4070. Filter your Steam library on the PC4Games comparator before checkout.

Why this thread keeps resurfacing on Reddit — it is not a simple FPS score

Many US builders upgrade from a 3060 Ti / 3070 and stall between a used Ampere flagship and new Ada. The 3080 is still a raster beast; the 4070 mainly adds efficiency, VRAM, and a newer software stack.

Classic mistake: comparing a $380 Marketplace 3080 to a $450 Newegg 4070 and calling it « same money, buy the stronger card ». Add PSU upgrade cost (often +$100–120 if you jump from 550 W to 750 W), used risk (mining, tired VRAM), and no DLSS 3 on Ampere.

Staying 100 % used Ampere? See 3080 vs 3070. Want new Ada without Ampere baggage? This guide is the right fork.

US July 2026 table — specs, street prices, and raster FPS

Indicative PC4Games FPS (high/ultra, no DLSS Frame Generation). The GpuComparison widget at the top uses the same five games.

RTX 4070 vs RTX 3080 — US market, July 2026
MetricRTX 4070RTX 3080US buyer note
Typical price$425–$475 new$325–$425 used3080 $80–120 cheaper on a good deal
ArchitectureAda AD104Ampere GA1024070 newer stack
VRAM12 GB GDDR6X10 GB GDDR6X4070 +2 GB
Reference TDP~200 W~320 W4070 −120 W
Cyberpunk 2077 1080p~112 FPS~105 FPS+7 → 4070
Fortnite 1080p~208 FPS~198 FPS+10 → 4070
Hogwarts Legacy 1440p~76 FPS~68 FPS+8 → 4070
Warzone 1440p~138 FPS~128 FPS+10 → 4070
RDR2 1440p~100 FPS~92 FPS+8 → 4070
DLSS 3 Frame GenYesNo (DLSS 2 max)4070
WarrantyNew 2–3 yrUsed varies4070
RTX 4070 vs RTX 3080 — US market, July 2026

1080p 144 Hz: a vetted used 3080 still hits hard

At 1080p ultra/high, both cards clear 100+ FPS on most AAA — 150+ in esports. Cyberpunk 1080p: ~112 vs ~105 FPS. Fortnite: ~208 vs ~198 FPS. Warzone: ~178 vs ~168 FPS.

If you already game on 1080p 144 Hz and find a tested 3080 at $325–$375, raster is plenty. The new 4070 mainly buys thermal headroom, DLSS 3, and RMA peace of mind — not doubled FPS at Full HD.

Tight 1080p budget profile: a clean 3080 can beat a 4070 on raw $/FPS — as long as you are not also buying a new PSU.

1440p: the 4070 margin that actually matters

This is where the fork gets real. Cyberpunk 1440p: ~84 vs ~78 FPS. Hogwarts: ~76 vs ~68 FPS. RDR2: ~100 vs ~92 FPS. The raster gap stays modest, but the 4070 holds high/ultra longer on 2025–2026 AAA.

The 3080 plays great at 1440p medium–high with DLSS Quality — but 10 GB tightens faster on ultra textures + RT. The 4070 with 12 GB leaves more room without dropping to medium in dense zones.

Buying a 27″ 1440p 144 Hz panel this year? New 4070 is the rational GPU. Staying on 1080p for years? A 3080 under $375 can be enough — see ~$1,100 gaming PC builds.

12 GB vs 10 GB, DLSS 3, and an eBay / Marketplace used checklist

The 4070 ships 12 GB GDDR6X — useful for 1440p ultra, light mods, or Chrome + game multitasking. The 3080 at 10 GB still plays fine, but hits limits sooner on Cyberpunk RT ultra or Starfield high textures.

The real software fork: DLSS 3 Frame Generation on the 4070 (Cyberpunk, Hogwarts, Alan Wake 2, Fortnite…). The 3080 caps at DLSS 2 — fine, but without FG smoothness on supported titles.

Used 3080 checklist: demand 10 min FurMark + GPU-Z screenshot (no artifacts, stable temps); avoid suspiciously cheap mining listings; above $425, compare a new 4070 under $450 on r/buildapcsales before you pay.

PSU, power bill, and 3080 → 4070 upgrade logic

TDP: ~200 W (4070) vs ~320 W (3080). In practice: 550–650 W 80+ Gold covers the 4070 with Ryzen 5 / Core i5. For the 3080, target 650–750 W quality — an old 550 W bronze from a Dell prebuilt can block the used deal.

At 4 h/day and ~$0.15/kWh, the 4070 might save ~$25–35/year vs a 3080 — small next to purchase price, but the 4070 stays quieter in compact cases.

3080 → 4070 upgrade: makes sense if you want DLSS 3, less heat, or if 10 GB blocks your 1440p presets. Not mandatory if your 3080 already runs 1080p high — raster alone (~10 %) rarely justifies +$100–$125 without a monitor change. Cross-check on the PC4Games comparator and the US GPU price tracker.

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Frequently asked questions

RTX 4070 vs RTX 3080 — which is faster?

The **RTX 4070** in raster: roughly **5–12 %** depending on the game (Cyberpunk 1080p **~112 vs ~105 FPS**, 1440p **~84 vs ~78 FPS**). The edge also shows up in **efficiency** and **DLSS 3**. See **GpuComparison** on this page.

RTX 4070 new or RTX 3080 used in the US in 2026?

**4070 new** ($425–475 before tax) by default: warranty, **12 GB**, **DLSS 3**, **~200 W**. **3080 used** ($300–400) only **under ~$350**, FurMark-tested, with a **650–750 W** PSU already installed. Above that, buy Ada.

Is the RTX 4070 worth the premium over a used 3080?

Yes for a **new purchase**: RMA, Frame Generation, less heat. A **3080** only makes sense in **very clean used deals under ~$350** — compare **eBay sold** and **r/buildapcsales** the day you pay.

RTX 4070 or RTX 3080 for 1440p gaming?

Both handle **1440p**, but the **4070** holds **high/ultra** longer thanks to **12 GB** and **DLSS 3**. The **3080** lives at **medium-high** or **DLSS Quality** on recent AAA.

Does 12 GB vs 10 GB VRAM matter?

Yes at **1440p ultra** and light mods: **12 GB** leaves more headroom. **10 GB** still works at **1080p high**, but tightens faster on textures + RT in Cyberpunk or Starfield.

What PSU do I need for RTX 4070 and RTX 3080?

**550–650 W 80+ Gold** for the **4070** with Ryzen 5 / Core i5. **650–750 W** quality for the **3080** — an old **550 W** bargain PSU can kill a used 3080 deal.

What are fair new vs used prices in July 2026?

**4070 new**: **$425–475** (strong deal **under ~$450**). **3080 used**: **$300–400** (strong deal **under ~$350**). Above **~$400** for a 3080, compare a sale **4070** on **Newegg** or **Amazon**.

Is upgrading from RTX 3080 to RTX 4070 worth it?

Worth it if you want **DLSS 3**, less heat, or if **10 GB** blocks 1440p presets. Not mandatory if your **3080** already runs **1080p high** — raster alone (~10 %) rarely justifies **+$80–120**.

Does DLSS 3 really change the decision?

Often yes on Cyberpunk, Hogwarts, Alan Wake 2, Fortnite: **perceived smoothness** with Frame Generation can tip the scale toward a **new 4070** over a **3080** stuck at **DLSS 2**.

How do I test a used RTX 3080 on eBay before buying?

Ask for **10 min FurMark** + **GPU-Z** screenshot (no artifacts, stable temps). Avoid suspiciously cheap mining listings. Confirm your **PSU** handles **320 W** peaks — otherwise budget **+$80–120** for a new unit.

Sources & methodology

How we wrote this guide

PC4Games RTX 4070 vs RTX 3080 comparison (15 July 2026): raster FPS aligned with GpuComparison, Amazon/Newegg/eBay pricing, new Ada vs used Ampere logic — distinct from the 3080 vs 3070 guide.

  • Indicative raster benchmarks without DLSS Frame Generation (Cyberpunk, Fortnite, Hogwarts, Warzone, RDR2).
  • US new and used market pricing before sales tax, July 2026 — eBay sold thresholds.
  • Update when price gap moves more than 10% per quarter.

Sources

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