A quick glance at the architectonics of the new GeForce 7900 alternation articles shows that little has afflicted in agreement of the accepted block diagram. That’s not to say, however, that the G71 dent itself isn’t radically altered from its predecessor, the G70, which became accepted as the GeForce 7800 GTX. Although genitalia of the G71 accept been re-architected for ability and transistor saving, the GeForce 7900 does borrow heavily from the G70.
GeForce 7900 Alternation GPU Block Diagram90nm – 278M transistors
For the GeForce 7900 we’re still adorable at a 24 pixel activity apparatus that comes able with 16 Raster Ops and 8with 8 acme shader units and 16 ROPs. The GPU additionally still derives its anamnesis absorber bandwidth over a 256-bit interface as well. This new GeForce 7 alternation GPU is congenital on TSMC’s new 90nm artifact process, which is absolutely arch bend by today’s standards, but conceivably aloof not “bleeding edge” area it’s oh-so accessible to get cut aggravating to t a falling knife, so to speak. We’re abiding 65nm is on the border for the aloft cartoon vendors as well, but for now 90nm action geometries are added than able for bringing these awful circuitous Cartoon Processor cores to market.
Speaking of which, the new GeForce 7900 alternation has absolutely lightened its amount a bit by bottomward a few transistors as a aftereffect of architectonics optimizations and tweaks, fabricated to the Shader Engines, ROPs, SLI interface, and Z-Cull logic, in this circuit of the chip. The ROPs accurately accept been re-architected to advance aggregate performance, while added portions of the dent were tweaked for efficiency. The aftereffect is that the new GeForce 7900 alternation has a 278 actor transistor calculation against about 302 actor transistors in the GeForce 7800 GTX. Adorable analogously at the die admeasurement against ATI’s new Radeon X1900 alternation product, you’ll additionally agenda that the GeForce 7900 alternation is decidedly smaller, 196mm2 against 352mm2 to be exact. This was allotment of NVIDIA’s access on this architectonics refresh, one we feel that should absolutely augur actual able-bodied for them, from an all-embracing amount standpoint.
The GeForce 7900 still alone has 24 pixel shader engines, which about sounds a bit bare back you accede the Radeon X1900 XT alternation comes able with 48 pixel shaders but those 48 shader engines are alone accurate by 16 Raster Operators in the X1900 and counterbalanced assets in any architecture, are consistently critical. Adding in added Raster Ops forth with Shader Engines would best absolutely draft out die admeasurement alike more, so instead NVIDIA chose to drive the accomplishment action to 90nm, which offers accessible assets in both alarm speeds, die size, thermals and ability consumption. Back you accede how able-bodied the GeForce 7800 performs with its 430 – 450MHz core, it doesn’t booty a rocket scientist to apperceive that a 200MHz access in alarm acceleration and a bit added head-room on that anamnesis interface speed, could acceptable be all that’s bare to booty the accepted architectonics to the aing level. And brainstorm what 90nm could do for costs, with the aforementioned alarm speeds. It becomes bright that NVIDIA may accept played this one masterfully, as continued as TSMC’s action can agitate out the volume.
NVIDIA GeForce 7900 GTX:24-Pixel Shader Units / 8 Acme Shader Units / 16-ROPs / 256-Bit Anamnesis Interface650MHz Amount / 700MHz Acme / 800MHz (1.6GHz DDR) Anamnesis (256MB) – Appraisement $499 – $649
As you can see, the new GeForce 7900 GTX looks aloof like the 512MB 7800 GTX it usurps as NVIDIA’s flagship desktop part. A quick beheld analysis did not acknowledge any differences in the PCB design, and both cards allotment the aforementioned dual-slot acknowledgment with heat-pipes, which aboriginal appeared on NVIDIA’s high-end Quadro workstation cartoon cards. There are some aloft differences amid the 7900 GTX and 7800 GTX, though. First, the 7900 GTX now appearance a brace of dual-link DVI outputs, acknowledgment to the two dual-links TMDSs aural the G71 GPU. As we mentioned earlier, the GPU is additionally bogus on a added avant-garde 90nm processes which accustomed NVIDIA to crank the amount alarm acceleration way up on the 7900 GTX. The advertence blueprint calls for a GPU clocked at 650MHz, with a 700MHz geometry clock. And the card’s 512MB anatomy absorber is clocked at 800MHz (1.6GHz DDR), which is absolutely a bit lower than the 512MB GeForce 7800 GTX. The GeForce 7900 GTX additionally appearance a new 7-pin HDTV output, as against to the 9-pin achievement on antecedent cards, that supports absolute affiliation of S-Video cables or an HD Component achievement adapter. NVIDIA expects appraisement on the 7900 GTX to abatement aural the $499 to $649 range, depending on the specific agenda agreement and array offered by their lath partners. That’s a advanced range, for sure, but in-line with what the bazaar has accurate the accomplished brace of artefact cycles.
The GeForce 7900 GTX additionally absolutely supports NVIDIA’s almost new Quad-SLI technology, which links four GPUs calm for added achievement and potentially bigger angel affection back application SLIAA — up to 32X AA in fact. At CES we saw what was about four GeForce 7800 GTX cards active in Dell’s high-end XPS Renegade rig, but at a contempo event, NVIDIA was assuming of Quad-SLI GeForce 7900 rigs from a scattering of cardinal partners, including Alienware, Falcon and Voodoo. We achievement to accompany you a absolute attending at a Quad-SLI rig in the a approaching and plan to go added all-embracing then. What we can acquaint you now is that NVIDIA fabricated accurate quad-SLI accessible by designing a 48-lane, 3-port PCI Express switch, which offers abounding PCI Express x16 bandwidth to all four GPUs back installed on an nForce 4 SLIX16 chipset based motherboard. And to absolutely accouter the ability of four GPUs, NVIDIA is introducing a new apprehension approach alleged “AFR of SFR”. To put it simply, with AFR of SFR rendering, alternating frames are again aperture in two genitalia with anniversary GPU alone alive on about half, or every added frame.
NVIDIA GeForce 7900 GT:24-Pixel Shader Units / 8 Acme Shader Units / 16-ROPs / 256-Bit Anamnesis Interface450MHz Amount / 470MHz Acme / 660MHz (1.32GHz DDR) Anamnesis (256MB) – MSRP $299 – $399
We doubtable this aing accession to the GeForce 7 alternation agency will be actual accepted amidst the Enthusiast and Gaming communities. The new GeForce 7900 GT is about a scaled-down 7900 GTX, that differs from the new flagship in alone a few ways. The 7900 GT and 7900 GTX allotment the exact aforementioned GPU with bifold dual-link DVI outputs, but it is clocked at a added bourgeois 450MHz as per the advertence spec. The 7900 GT additionally sports a 256MB anatomy absorber clocked at 1.32GHz, bisected that of the GTX, a smaller, beneath busy PCB, and a abundant smaller, single-slot nut cooler. The blueprint put the 7900 GT aloof aloft the 256MB 7800 GTX in NVIDIA’s artefact line-up, but the appraisement calibration for the 7900 GT is abundant added attractive. NVIDIA expects cards to be accessible for prices amid $299 to $399, depending on the anatomy absorber configuration, alarm speeds, and bundles offered by their partners.
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