Company ATI new chipset (or even a series of chipsets) which should provide fashionable marketing feature support of two polnoskorostny'h graphic interfaces PCI Express x16, certainly, with support is literally one of these days is going to announce. Before a similar step has made NVIDIA with a chipset nForce SLI X (in this context we shall not mention), and before wishing it was necessary to create system SLI/CrossFire to be content with less high-speed combination of graphic interfaces. In the majority of products in the market (chipsets NVIDIA, ATI) it was for such a case used the formula x8+x pad notebook throughput of the unique interface x was fifty-fifty distributed between two slotami (form-faktora, certainly, PCIEx16). However chipsets Intel, the first offered to users interface PCI Express, did not possess such opportunity even in the second generation , therefore some manufacturers of parent payments resorted to the non-standard decision with the formula x16+x4. In this case the first graphic slot is served by forces of actually graphic interface (x16), and the second is connected not to northern, and to the southern bridge and will involve its four lines PCI Express generally pad notebook intended for connection of periphery. And if at a payment on i945/9 with southern bridge ICH7R remains in this case though two free lines PCI-E decisions with southern bridge ICH or on lost the new interface completely. (However, cards of expansion with interface PCIEx in the market even now practically are not present, so the buyer of such payment lost, as a matter of fact, only the integrated controllers (LAN, SATA RAID), connected to trunk PCI Express.) Only i975X has allowed to organize division of the graphic interface into two slota pad notebook under the formula x8+x8, as at competitors. It seemed to us interesting to check up, whether there is in real appendices a difference between different chipsets or different ways of organization SLI/CrossFire even at current decisions. The matter is that even manufacturers of videoaccelerators do not promise an appreciable gain from transition to a mode x16+x16, naming cautious figure of % for topovy'h models in the heaviest conditions. Today's clause in which we use two accelerators on the basis of ATI Radeon pad notebook X8 XT (more high-speed cards in enough at the moment of testing in our laboratory also is devoted to studying of this question were absent) Research of productivity the Test stand Sapphire PC-A9RD480Adv (version BIOS I-4M) on chipset ATI Xpress 2 CFE (AMD) ECS PA MVP (2.0) (version BIOS 1.0A) on chipset ATI Xpress 2 CFE (Intel The basic: [PCIEx16] Sapphire (ATI) Radeon X8 XT CrossFire Edition (2 MB) Additional: [PCIEx16] PowerColor (ATI) Radeon X8 XT PE (2 MB Results of tests As platforms for testing are taken almost all available, in view of that chipsets NVIDIA do not allow pad notebook (we we hope while) to start two CrossFire-uskoritelya though division of the graphic interface for two SLI-kart at them is. Thus, the system on AMD has remained in proud loneliness of corresponding serial products on chipsets VIA and SiS we yet did not see. At once we wish to note what directly to compare its results with three Intel-sistemami it is not necessary, as processors, certainly, different (the unique principle of pad notebook their selection was affinity to topovy'm to decisions as small as possible to brake a sheaf of videocards). Moreover, we did not set as the purpose to maximize results of each of platforms more likely, on the contrary, tried to level them for what started payments with support DDR at taymingah 4-4- as payment ECS PF Extreme smaller has not pulled. However, ECS PA MVP (2.0) also has at all refused to inform us with what taymingami it will start (opportunities to expose them compulsorily also was not). So, our problem today to observe possible differences pad notebook CrossFire Ready-platy' (ECS PF Extreme) from CrossFire Ready-chipseta (i975X), and also from second chipset ATI Xpress 2 CrossFire Edition which name speaks for itself. Results of system with processor AMD are given as repernoy points though on them we, certainly, shall make the certain conclusions. However before to rush to games, it is necessary to estimate the abstract speed of each of platforms to not mix possible effect from more successful realization CrossFire with the usual superiority in productivity at work with pad notebook memory. Really, the difference in speed between systems is available, and i975X wins pair percent at [the concrete representative] i955X and up to % against chipset ATI. The different processor architecture inevitably leads to a difference between platforms Intel and AMD, however here again there is an interesting moment which was difficult for predicting in advance. All systems with processor Pentium EE practically have not reacted to inclusion CrossFire, while results of a payment with not the weakest Athlon 40 + proseli (da-da, pad notebook you in fact did not expect, what addition of the second videoaccelerator will accelerate process arhivirovaniya?!) almost on %. Not so it is a lot of, but evident demonstration of advantage from Hyper-Threading: the second logic processor entirely incurs service Catalyst AI. However, coding of video practically is not slowed down in all cases so, finally, the intelligence of videodrivers ATI manages not too expensively. Now about 3D-prilojeniyah. pad notebook Probably, it is necessary to remind, that all is far not games receive a prize from rasparallelivaniya rendering of a picture or because of defects in drivers, or that productivity of system rests not against the videoaccelerator, and in any other component (as a rule, the processor). So, we did not begin to result in clause honesty finished shooting parameters in SPECviewperf (here inclusion CrossFire causes delay of work up to two times) and game Painkiller ( %); a situation as a whole eloquently illustrates Unreal Tournament pad notebook 2004: Let's address to those two games in which the effect from CrossFire is observed. Certainly, in 6 4 at the minimal quality schedules we shall test processors at any a little to a modern videocard so here we receive a picture rather reminding the test on arhivirovanie. Mode 10 7 at adjustments schedules High it, actually, a critical point where the CENTRAL PROCESSING UNIT by opportunities is tightened to busy X8 XT; here it is already possible to expect a prize from CrossFire. Really, small gain is in all cases, though these of % obviously insufficient pad notebook reason for purchase of pair videoaccelerators. The difference in effect from CrossFire at three chipsets under Pentium is so insignificant, that any serious conclusions to do it is impossible. At last, 16 12 at the maximal quality schedules which adjustment of game allow to achieve, it just benefit performance of decision ATI; we shall look at result closely. First, we shall note, that at work with one card three systems obviously rest against productivity X8 XT, and on pad notebook this background the raised speed of payment Gigabyte G1975X can be explained unless by automatic dispersal of the videoaccelerator. Certainly, at testing we disconnect similar functions in BIOS Setup, but, possibly, in case of Gigabyte to make it it is impossible. Now, if to speak about a difference in effect from CrossFire, well noticeably, that unique platform AMD wins more other (+ %), against the others pad notebook parameters such: ATI Xpress 2 CFE + %, i955X + %, i975X + %. The mode 6 4 in FarCry differs nothing essentially from those in Doom acceleration about zero or negative. The mode 10 768, High already is a positive effect, though also modest ( %). However we shall note a difference on the minimal parameter fps: everywhere small falling at inclusion CrossFire so, apparently, dependence on speed of the processor pad notebook here is observed. Divergences between systems are very insignificant, about distinctions in a gain from CrossFire seriously to speak it is not necessary. At last, the most interesting: the maximal mode. Again the same artefact of productivity at i975X (a gain from CrossFire only % because of slightly overestimated general speed), other results are almost identical (~ %). Apparently, here even sheaf CrossFire rests against own productivity, and speed of processors is superfluous. And here about the minimal parameter fps it to tell pad notebook it is impossible, the superiority of system with Athlon 40 + here is precisely observed: in mode CrossFire at it this parameter above on % while at systems with Pentium EE 3, GHz the gain makes only ~ %. The difference between Intel-sistemami almost is absent Conclusions summing up to our today's testing, we shall note a number of the noticed facts: Far not all games (and other 3D-prilojeniya) allow to be developed CrossFire-svyazke two X8 XT at practically fastest one-nuclear processors in rulers AMD and Intel for today. For the given combination completing some effect starts to appear with pad notebook the sanction 10 7 at almost maximal quality schedules (certainly generalize these figures on all games we we can not). In the heaviest game modes speed CrossFire-sistemy' can be limited again to productivity of the CENTRAL PROCESSING UNIT though a single videocard of speed of the processor sufficed much. In the majority of such cases productivity appears above at processors AMD. Speed CrossFire-sistemy' depends on so-called productivity of a chipset (basically a defined subsystem of memory) approximately in the same measure, as pad notebook speed of a single card of the recommendation on purchase are obvious. At last, the most interesting: in our conditions (and test ON) any difference between operating modes of two videocards x8+x or x16+x we have not found out a set of iron (that, generally speaking, does not mean, that it cannot be found out in other conditions). These data allow to leave, first, ideas on necessity of purchase of a payment with support x16+x if you do not gather prikupat' to it pair X19 XT or GeForce 78 GTX. Secondly, on results of today's research it is pad notebook possible to recommend safely to those who is going to take a payment under CrossFire on vy'rost, to choose model to itself on a shower, not paying special attention to the formula of functioning slotov for schedules (if only them was two). You and do not buy probably, second card, but in any case in productivity will lose hardly Other discussions in conference: Comments? Amendments? Additions?

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