Malo offtopica u startu
Ovo je moj prvi pokušaj da napišem nešto pametno, cisto da vidim mogu li ja to. I ofkors da vidim razliku izmeðu ove dvije kartice. Da danas sam bio mišljenja da ATI/AMD prodaju maglu sa novim proizvodima, samo da se furaju na marketing i da sa serijom 4*00 ne nude ništa novo, odnosno ništa generalno bolje od suparnika Nvidia-e.
Pobliže o samim karticama. Referentna 8800GT od proizvođaća Club3D, dolazi sa standardnim frekvencijama i single slot hladnjakom. Pošto je to moja kartica, radi poveće buke i temperatura instalirao sam accelero S1 pasivni hladnjak, i na njega pričvrstio 120mm ventilator. Kartica ima vrlo visoki overclock potencijal, iz tog razloga sam overclockao istu na frekvencije 700-1750-2100MHz. To je neki 100% stabilan takt za ovu karticu, i pri ovom taktu nije bilo problema niti s jednim testom.
Što se tiće HD4850, na test sam uvrstio Sapphire-ov model Toxic. Dosta toga se zna o navedenoj kartici. Najbitnije je da dolazi sa Zalman hladnjakom VF900, i dignutim radnim taktovima. Pošto je kartica tvornički OC-ana, smanjio sam frekvencije na defaultne za HD4850 seriju i usporedio sa default 8800GT karticom.
Tvorničke OC postavke sam koristio za usporedbu sa 8800GT 512 OC. Tako da na kraju umjesto dvoboja 1 na 1, imamo 4 kartice na testu.
Kartice, samu tehnologiju i pakiranje neću previše doticati s ovim reviewom, jer ne uspoređujem konkretne kartice veæ cijelu seriju, kao što se iz naslova vidi.
Za testranje sam koristio vrlo malo sintetičkih testova, orjentirao sam se više na realnom prikazu snage kartica kroz igre. Neki game benchmarks tools-i nisu radili kako treba, tako da sam veliki dio igara testirao sa Fraps programom. Minus ovog načina mjerenja je jasan svima, ali je bio jedini mogući način. Testni dijelovi igara su bili dobro memorirani, tako da testovi moraju biti vjerodostojni. Krenimo sada dalje...
Mali pregled HD4800 serije i arhitekture:
Code:
+ 956 million transistors on 55nm fabrication process
+ PCI Express 2.0 x16 bus interface
+ 256-bit GDDR3/4/5 memory interface
+ Microsoft® DirectX® 10.1 support
- Shader Model 4.1
- 32-bit floating point texture filtering
- Indexed cube map arrays
- Independent blend modes per render target
- Pixel coverage sample masking
- Read/write multi-sample surfaces with shaders
- Gather4 texture fetching
+ Unified Superscalar Shader Architecture
- 800 stream processing units
o Dynamic load balancing and resource allocation for vertex, geometry, and pixel shaders
o Common instruction set and texture unit access supported for all types of shaders
o Dedicated branch execution units and texture address processors
- 128-bit floating point precision for all operations
- Command processor for reduced CPU overhead
- Shader instruction and constant caches
- Up to 160 texture fetches per clock cycle
- Up to 128 textures per pixel
- Fully associative multi-level texture cache design
- DXTC and 3Dc+ texture compression
- High resolution texture support (up to 8192 x 8192)
- Fully associative texture Z/stencil cache designs
- Double-sided hierarchical Z/stencil buffer
- Early Z test, Re-Z, Z Range optimization, and Fast Z Clear
- Lossless Z & stencil compression (up to 128:1)
- Lossless color compression (up to 8:1)
- Up to 8 render targets (MRTs) with anti-aliasing
- Accelerated physics processing
+ Dynamic Geometry Acceleration
- High performance vertex cache
- Programmable tessellation unit
- Accelerated geometry shader path for geometry amplification
- Memory read/write cache for improved stream output performance
+ Anti-aliasing features
- Multi-sample anti-aliasing (2, 4, or 8 samples per pixel)
- Up to 24x Custom Filter Anti-Aliasing (CFAA) for improved quality
- Adaptive super-sampling and multi-sampling
- Gamma correct
- Super AA (ATI CrossFireX™ configurations only)
- All anti-aliasing features compatible with HDR rendering
+ Texture filtering features
- 2x/4x/8x/16x high quality adaptive anisotropic filtering modes (up to 128 taps per pixel)
- 128-bit floating point HDR texture filtering
- sRGB filtering (gamma/degamma)
- Percentage Closer Filtering (PCF)
- Depth & stencil texture (DST) format support
- Shared exponent HDR (RGBE 9:9:9:5) texture format support
+ OpenGL 2.0 support
+ ATI Avivo™ HD Video and Display Platform6
- Unified Video Decoder 2 (UVD 2) for H.264/AVC, VC-1, and MPEG-2 video formats
o High definition (HD) playback of Blu-ray and HD DVD video
o Dual stream (HD+SD) playback support
o DirectX Video Acceleration 1.0 & 2.0 support
o Support for BD-Live certified applications
- Hardware DivX and MPEG-1 video decode acceleration
- Accelerated video transcoding & encoding for H.264 and MPEG-2 formats
- ATI Avivo Video Post Processor6
o Color space conversion
o Chroma subsampling format conversion
o Horizontal and vertical scaling
o Gamma correction
o Advanced vector adaptive per-pixel de-interlacing
o De-blocking and noise reduction filtering
o Detail enhancement
o Color vibrance and flesh tone correction
o Inverse telecine (2:2 and 3:2 pull-down correction)
o Bad edit correction
o Enhanced DVD upscaling (SD to HD)
o Automatic dynamic contrast adjustment
- Two independent display controllers
o Drive two displays simultaneously with independent resolutions, refresh rates, color controls and video overlays for each display
o Full 30-bit display processing
o Programmable piecewise linear gamma correction, color correction, and color space conversion
o Spatial/temporal dithering provides 30-bit color quality on 24-bit and 18-bit displays
o High quality pre- and post-scaling engines, with underscan support for all display outputs
o Content-adaptive de-flicker filtering for interlaced displays
o Fast, glitch-free mode switching
o Hardware cursor
- Two integrated dual-link DVI display outputs
o Each supports 18-, 24-, and 30-bit digital displays at all resolutions up to 1920x1200 (single-link DVI) or 2560x1600 (dual-link DVI)2
o Each includes a dual-link HDCP encoder with on-chip key storage for high resolution playback of protected content3
- Two integrated 400 MHz 30-bit RAMDACs
o Each supports analog displays connected by VGA at all resolutions up to 2048x15362
- DisplayPort output support
o 24- and 30-bit displays at all resolutions up to 2560x16002
- HDMI output support
o All display resolutions up to 1920x10802
o Integrated HD audio controller with support for stereo and multi-channel (up to 7.1) audio formats, including AC-3, AAC, DTS, DTS-HD & Dolby True-HD4, enabling a plug-and-play audio solution over HDMI
- Integrated AMD Xilleon™ HDTV encoder
o Provides high quality analog TV output (component/S-video/composite)
o Supports SDTV and HDTV resolutions
o Underscan and overscan compensation
- Seamless integration of pixel shaders with video in real time
- VGA mode support on all display outputs
+ ATI PowerPlay™ Technology5
- Advanced power management technology for optimal performance and power savings
- Performance-on-Demand
o Constantly monitors GPU activity, dynamically adjusting clocks and voltage based on user scenario
o Clock and memory speed throttling
o Voltage switching
o Dynamic clock gating
o Central thermal management – on-chip sensor monitors GPU temperature and triggers thermal actions as required
+ ATI CrossFireX™ Multi-GPU Technology
- Scale up rendering performance and image quality with two, three, or four GPUs
- Integrated compositing engine
- High performance dual channel bridge interconnect1
HD4850 Toxic - Pakiranje, bundle i kartica:
Kartica dolazi u zanimljivom pakiranju, kutija je lijepa, kartica je dobro zaštićena od udaraca. Bundle je poveći i jedan od najboljih što sam vidio u zadnje vrijeme.
Glavno obilježje HD4850 Toxic kartice su povišeni taktovi i Zalman VF900. Taktovi referentne verzije HD4850 su 625Mhz za jezgru i 993MHz za memoriju. Taktovi Toxic verzije su 675MHz za jezgru i 1100MHz za memoriju. Osnovni problem ovog modela je nemoguènost softverske regulacije ventilatora, te se on okreæe na 1750 rpm, što je previše zbog loše kvalitete samog ventilatora i generira veliku buku. Uz manji mod, moguće je spojiti Zalman Fanmate 2 na karticu i s njim regulirati okretaju. Temperature se kreću od 40-45 stupnjeva u idle, u loadu se temperatura penje na prihvatljivih 65 stupnjeva.
Testna konfiguracija:- Procesor: Intel C2D E6700 @ 3GHz
- Memorija: 2x2GB OCZ Vista Upgrade XTC 900Mhz, 5-5-5-15
- Matična ploča: Gigabyte P35 DS3P
- Hard disk: ST3320620AS + STM3500320AS
- DVD-RW: Asus, model nepoznat
- Napajanje: Silverstone Strider 750W
- Kučište: Raidmax Scorpio big tower
- Monitor: Lenovo L220x
- OS: Windows XP Professional SP2,32 bit
Driveri koji su bili korišteni:- ForceWare 177.92
- ATI Catalist 8.10
Korištene igre I benchmark alati:- 3Dmark06
- Lightsmark 2007
- Crysis Benchmark tool
- Unreal Tournament 3 benchmark tool
- Prey benchmark tool
- DIRT – by Fraps
- GRID – by Fraps
- COD4 –by Fraps
- Mass Effect – by Fraps
- TCRS Vegas 2 – by Fraps
- S.T.A.L.K.E.R. Clear Sky – by Fraps