The latest and possibly the last member of AMD’s all conquering 45nm 5xxxx DX11 series of graphics cores is the Radeon HD 5830. “Why yet another 5 series card?” we hear you ask. Well, quite simply it fills in the gap both in price and performance between the HD5770 and the HD5850 cards that have been out for some time.
Based on the LE version of the Cypress core, the HD5830 may still have the 2.15 billion transistors of its Cypress siblings, but it has a fair chunk of the stream processors disabled, so while the HD5870 has 1,600 stream processors, the HD5830 has to make do with a mere 1,120. Also cut down are the number of render output units. This, together with the reduced stream processers, means that the pixel fillrate is very much reduced.
To try to make up a little for this, the core clock runs at 800MHz while the 1GB of GDDR5 runs at 1,000MHz (4,000MHz effective) through a 256-bit bus, giving a memory bandwidth of 128GB/s.
HIS currently has four HD5830 cards in the its line-up: all have HIS’s iCooler V non-reference cooler, two have stock cores while the other two are from the Turbo range. The difference between the two cards in each range is that one has a fancy Call of Duty: Modern Warfare sticker on the cooler and a coupon for the game in the box. If this is the version you want, make sure you see GDG at the end of the product code.
The Turbo version of the HD5830, as with all the Turbo family, comes with factory overclocked core and memory engines. The tweak to the core adds another 40MHz to the stock speed (840MHz) while the memory clock gains another 100MHz so it runs at 1,100MHz (4,400MHz effective).
Performance-wise the factory overclocking pushes the HD5830 Turbo nearer to the HD5850. Benched using Crysis Warhead at a 1,680 by 1,050 pixel resolution, it gave an average frame rate of 34fps compared to the standard HD5830′s 29 (the HD5770′s score at this resolution is 25fps while the HD5850 is 45fps). Upping the resolution to 1,920 by 1,200 produces a frame rate of 27fps for the HD5830 Turbo compared to 23fps for the standard HD5830, 21fps for the HD5770 and 32fps for the HD5850.
To power the card you’ll need two 6-pin PCI-E power connectors, but don’t worry if your power supply doesn’t have any spare as there are two 4-pin Molex to 6-pin PCI-E adaptors bundled in the box, along with a CrossFire bridge and a DVI to VGA adaptor.