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GeForce GTX 660 (Reference design)

Reference design · 2 GB · catalogue identifier gtx-660-ref · last updated 2026-09-25

82 desktops in this database carry a verdict for the GeForce GTX 660 (Reference design): 19 fit with conditions, 46 do not fit (9 of these are estimates) and 17 are unverified. Estimated Conditions most often concern card width (19 desktops), the auxiliary power connector (14) and card length (13). Of the 46 desktops it does not fit, 31 conflict with a half-height-only slot and 27 with the desktop's maximum card length; the Dell OptiPlex 3090 Small Form Factor (2021) is one of the 31. Estimated Among the 28 cards with 2 GB in this database, its board power of 140 W is within 19–230 W, with 19 lower and 8 higher; its length of 241 mm compares with 145–267 mm where published. Estimated No listed model fits in its 2 GB at 32k context; the smallest, Gemma 3 4B, needs 4.7 GiB.

Published specifications for this design, the OEM desktops whose own specifications accept it, and how much of a local language model its memory holds.

We have not physically tested this combination. Data is compiled from official specification sheets and cited sources.

“Reference design” is a specification, not a product. The figures below are the ones the chip vendor publishes for a baseline board: board power, auxiliary power connector and recommended system power. Cards sold by board partners are built to their own designs and differ in length, height and cooler. This database does not claim that a card built to this exact design was sold at retail, and where the chip vendor does not publish a dimension, the row below says so.

Specifications

Graphics processor
GeForce GTX 660
Card memory
2 GB · A read 2026-09-19 [S1]
Total board power
140 W · A read 2026-09-19 [S1]
Vendor's recommended system power
450 W — a figure for the whole system, not for the card alone · A read 2026-09-19 [S1]
Auxiliary power connector
6pin · A read 2026-09-19 [S1]
Length
241 mm · A read 2026-09-19 [S1]
Height
Not stated by the cited specification
Width
Not stated by the cited specification
Slot widths occupied
2 · A read 2026-09-19 [S1]
Low profile
No · A read 2026-09-19 [S1]
CUDA
Yes

Each graded figure above cites: [S1] GeForce GTX 660 specifications (official).

Power. Leave headroom; OEM PSUs are often rated at the limit. The recommended system figure above is the card vendor's own, and it assumes a retail supply rather than an OEM one.

Desktops that take a card of this design

This card has been assessed against 82 desktops in this database. Each verdict is a statement about published specifications, not about a tested combination.

  • ✓ Fits: 0
  • △ Fits with conditions: 19
  • ✕ Does not fit: 46 (9 of these are estimates) Estimated
  • ? Unverified: 17

Conditions shared by the desktops below. Each is stated once here. They come from this card's own records, or are worded the same for more than one desktop. A desktop listed below names the ones it carries by number; the figures particular to that desktop are on its own page.

  1. Card length: this card is 241 mm long. Card length: where a desktop publishes no maximum, measure the clearance in front of the slot and compare it with the card. (13 desktops)
  2. Card width: this card occupies 2 slots. (19 desktops)
  3. Card width: where a desktop publishes no slot-width ceiling, check that there is room beside the x16 slot. (9 desktops)
  4. Card width: where a desktop's maker offers a card at least as thick as this one as a factory option, that settles this card's width. It is a floor rather than a published ceiling, and says nothing about a thicker card. (10 desktops)
  5. Card width: where a row says a desktop's slot-width figure is recorded from third-party or community material, or from material whose source the record does not identify, rather than from a ceiling the manufacturer publishes, check that there is room beside the x16 slot. (3 desktops)
  6. Bracket height: where a row says whether a desktop takes only half-height cards is recorded from third-party or community material, or from material whose source the record does not identify, rather than from a statement by the manufacturer, check the slot opening. (2 desktops)
  7. Power: this card's vendor recommends a 450 W system supply. Power: a card vendor's recommended system supply covers the whole machine and carries the vendor's own margin, so judge it against the configuration you own. (6 desktops)
  8. Power: where a row says a desktop's supply rating is recorded from third-party or community material, or from material whose source the record does not identify, rather than from a specification the manufacturer publishes, read the rating off the label on the supply in the machine you own. (2 desktops)
  9. Auxiliary power connector: where a row says what a desktop's supply offers is recorded from third-party or community material, or from material whose source the record does not identify, rather than from a specification the manufacturer publishes, open the machine and look at the cable before buying. (5 desktops)
  10. Auxiliary power connector: this card needs a 6-pin connector. Auxiliary power connector: where a desktop's manufacturer does not publish what the supply offers, open the machine and look at the cable before buying. (9 desktops)

△ Fits with conditions 19 desktops:

✕ Does not fit 46 desktops, grouped by the published limit that conflicts with this card's published figures:

? Unverified 17 desktops. The evidence does not settle these either way, which is not the same as them being ruled out.

Verify with the manufacturer before purchasing.

What each verdict means. Every one of them is a statement about published specifications.
VerdictMeaning
✓ Fits Published specifications show no physical or electrical conflict.
△ Fits with conditions Published specifications allow it only under the stated conditions.
✕ Does not fit Published specifications rule the combination out: the card needs a connector the machine does not have, draws more than the supply provides, or is physically too large. It is a statement about specifications, not a report of a failed attempt.
? Unverified There is not enough evidence to say.

A dashed Estimated badge at the start of a line marks every verdict on that line as published as an estimate, and the grade beside it applies to each of them. The document behind each verdict, and the desktop's own figures, are listed on the desktop's own page. This card has a verdict for 82 of the 82 desktops in this database; the remaining 0 have not been assessed against it, which is not the same as them being ruled out.

Local language models this card's memory holds

Calculated from the published file size and the model architecture.
ModelOutcome Needs at 32k contextThe arithmetic Confidence
Qwen3 0.6B Q4_K_M △ Fits at short context only Estimated 4.9 GiB 2 GB of memory covers the 1.9 GB required at a context length of 4,096 tokens, but not the 4.9 GB required at 32,768 tokens. This outcome is no stronger than the figures it was calculated from: the size of the model file that is distributed is recorded here from third-party or community material, so grade D is shown alongside B. BD

✕ Exceeds VRAM 17 models need more memory at 32k context than this card has, 7 of them published as an estimate. The arithmetic for each is on the model's own page.

Exceeds VRAM does not mean the model will not run: inference software can keep part of a model in system memory. How fast that is, and whether it is pleasant to use, is outside what this site measures. The sizing rule and its constants are on the Methodology page.

Cards whose published memory size is the same, so the local-model outcomes on this page apply to them as well. Whether a given desktop accepts them is a separate question, answered on each card's own page.

Sources

Every document this page draws on, with the date it was read.
DocumentPublisherKindRead on
GeForce GTX 660 specifications (official) NVIDIA Manufacturer official documentation 2026-09-19
GeForce GTX 660 Specifications — Technical.city technical.city supporting 2026-09-19
NVIDIA GeForce GTX 660 — CpuTronic cputronic.com supporting 2026-09-19

We have not physically tested this combination. Data is compiled from official specification sheets and cited sources. Verify with the manufacturer before purchasing.