- May 13, 2008
- 538 (0.15/day)
|System Name||HTPC whhaaaat?|
|Processor||2600k @ 4500mhz|
|Motherboard||Asus Maximus IV gene-z gen3|
|Memory||Gskill Ripjaw 2x4gb|
|Video Card(s)||EVGA 1080 FTW @ 2037/11016|
|Storage||2x512GB MX100/1x Agility 3 128gb ssds, Seagate 3TB HDD|
|Display(s)||Vizio P 65'' 4k tv|
|Case||Lian Li pc-c50b|
|Audio Device(s)||Denon 3311|
|Power Supply||Corsair 620HX|
Not to sound like a AMD fanboy but I just read about the rumored AMD R9 265 which looks better than this (specs/price weise) but nothing is certain.
Not too tough to estimate a rough guess, though.
Scary math ahead.
(5400*128)/8 = 86.4gbps (bandwidth)
86.4/56.25 = 1.536TF (max usable shader compute)
1.536TF/960*2 = 800mhz
1150 (boost clock)/800*.16666 (special function) = ~.24
1.24*800 = 992mhz
992*960 = 1.9TF
1.9TF/(1024*2) = 930mhz (265 clockspeed is probably '925mhz' from amd, 975 AIB like 270)
1.9*56.25 = 107gbps
107*8/256 = 3348mhz (using 930mhz)
4800/3348 = 1.433
.433*.16 = ~6-7%
Obviously that number changes a little when considering slight efficiency differences (like tex units, which could bring it down a few percent), use cases (compute would be closer to the raw difference), and the core clock could be a little slower to a quite a bit faster than 930mhz, which while when faster increases performance more linearly than bw, would throw the difference bw makes off as obviously it would require more.
Yeah, it'll be faster at stock...but pretty close while being a much larger chip (even if salvage and using cheap 5ghz ram). That said, more logic + ideally low clocks (~900mhz/<5000mhz, where the process and mem controller are aimed) should keep power in check. The fact amd sells cheap and (usually) nvidia overcharges should keep the prices pretty close. It really comes down to two things:
1. How high can the mem clock on GM107, because while special function/bw voodoo of 16-17% will help at a higher clock when bw is scarce, it will be equally disproportionate scaling if bandwidth cannot feed the shaders.
2. How high can the core scale on 265? If limited to (for example) 1050mhz like 270, and the memory is crap elpida and hits (perhaps) 5300mhz, and the gm107 uses 6ghz on it's superior memory controller reaching closer to 7ghz overclocked, in theory around 1200mhz (little less on both counts) they could be roughly equal. How that plays out in power consumption considering die size, ram amount, etc is a good question.
Would that outcome surprise anyone? I bet it would not...two pretty similar-performing parts overall, even if massively different.