float A = _pTSet->m_fBCLK * _pTSet->m_fRatio;

Set B checks the primary timings (CR = Command Rate).

float B = _pTSet->m_fCL + (float)_pTSet->m_itRCD + (float)_pTSet->m_itRP + (9.0f * (float)_pTSet->m_iCR);

C & D check the secondary and tertiary timings, and has the lowest weighting;

float C = (float)(_pTSet->m_itRAS + _pTSet->m_itRRD + _pTSet->m_iREFCycleTime + _pTSet->m_iRefreshInterval + _pTSet->m_itWTR + _pTSet->m_itRTP + _pTSet->m_itCKE + _pTSet->m_itFAW + _pTSet->m_itWR + _pTSet->m_itWCL);

float D = (float)(_pTSet->m_iTRRDR + _pTSet->m_iTRRDD + _pTSet->m_iTWWDR + _pTSet->m_iTWWDD + _pTSet->m_iTRWDRDD + _pTSet->m_iTWRDRDD + _pTSet->m_iTRWSR);

Overall the calculation is as follows:

_pTSet->m_fEfficiency = (A * 127500.0f) / (53.0f * B + 0.6f * C + 20.0f * D);

Then, finally, if you run in dual chanel with an Ivy Bridge CPU, the score will be multiplied by 1.92x compared to single channel.

if (_pTSet->m_iNbChannels == 2) _pTSet->m_fEfficiency *= 1.92f;